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<h1>General Immunology: Cells and Immune Organs</h1>
<p>Lesson 1 | Dr. Mai Dieu Linh | Complete Study Notes</p>
</header>
<div class="toc">
<h2>Table of Contents</h2>
<ol>
<li><a href="#concepts">Key Concepts</a></li>
<li><a href="#functions">Functions of the Immune System</a></li>
<li><a href="#classification">Classification of Immunity</a></li>
<li><a href="#central-organs">Central Lymphoid Organs</a>
<ul>
<li><a href="#bone-marrow">Bone Marrow</a></li>
<li><a href="#thymus">Thymus</a></li>
</ul>
</li>
<li><a href="#peripheral-organs">Peripheral Lymphoid Organs</a>
<ul>
<li><a href="#lymph-nodes">Lymph Nodes</a></li>
<li><a href="#spleen">Spleen</a></li>
<li><a href="#malt">Mucosal Lymphoid Tissue (MALT)</a></li>
</ul>
</li>
<li><a href="#cells">Cells of the Immune System</a></li>
</ol>
</div>
<div class="container">
<!-- SECTION 1 -->
<div class="section" id="concepts">
<h2>1. Key Concepts</h2>
<table>
<tr><th>Term</th><th>Definition</th></tr>
<tr><td><span class="key-term">Immunity</span></td><td>The body's ability to resist pathogens.</td></tr>
<tr><td><span class="key-term">Immune System</span></td><td>Immune organs, cells, and molecules secreted by cells (e.g., antibodies).</td></tr>
<tr><td><span class="key-term">Immune Response</span></td><td>The immune system's response to microorganisms and harmful substances.</td></tr>
<tr><td><span class="key-term">Immunology</span></td><td>Study of the structure and function of the immune system and the body's immune responses.</td></tr>
</table>
</div>
<!-- SECTION 2 -->
<div class="section" id="functions">
<h2>2. Functions of the Immune System</h2>
<ul>
<li>Prevent and eliminate pathogenic infection (e.g., VSV)</li>
<li>Fight tumor growth</li>
<li>Regenerate damaged tissues</li>
</ul>
<h3>Disorders When Immune Function Fails</h3>
<ul>
<li><strong>Immunodeficiency</strong> – weakened or absent immune response</li>
<li><strong>Chronic inflammation</strong> – persistent, dysregulated immune activation</li>
<li><strong>Autoimmune disease</strong> – immune attack on self-tissues</li>
<li><strong>Graft rejection</strong> – immune response against transplanted tissue</li>
</ul>
</div>
<!-- SECTION 3 -->
<div class="section" id="classification">
<h2>3. Classification of Immunity</h2>
<div class="highlight-box">
<strong>Two main branches:</strong>
<ul>
<li><strong>Innate Immunity</strong> – non-specific, immediate, no memory (granulocytes, monocytes, NK cells, etc.)</li>
<li><strong>Adaptive Immunity</strong> – specific, delayed, has memory (T cells, B cells, antibodies)</li>
</ul>
</div>
<h3>Immune System Components</h3>
<ul>
<li><strong>Immune Organs</strong> – anatomical structures housing immune cells</li>
<li><strong>Immune Cells</strong> – active cellular components</li>
</ul>
<p>A balanced immune system <span class="arrows">↑</span> prevents invasion by bacteria/foreign objects and <span class="arrows">↓</span> does NOT attack normal tissues.</p>
</div>
<!-- SECTION 4 -->
<div class="section" id="central-organs">
<h2>4. Central Lymphoid Organs</h2>
<div class="highlight-box">
Central lymphoid organs are <strong>lymphoid stem cell organs</strong>. They produce stem cells and train them into mature cells — this process is <strong>antigen-independent</strong>.
</div>
<div id="bone-marrow">
<h3>4.1 Bone Marrow</h3>
<p>Not a classic lymphoid organ, but is where <strong>multipotent stem cells</strong>, immunocompetent precursor cells, and other blood cells are produced.</p>
<h4>Macroscopic Anatomy</h4>
<ul>
<li><strong>Red marrow</strong> – contains hematopoietic stem cells; actively involved in hematopoiesis</li>
<li><strong>Yellow marrow</strong> – contains mainly fat; less involved in hematopoiesis</li>
</ul>
<h4>Hematopoietic Cell Lines</h4>
<ul>
<li><strong>Myeloid line</strong> – granulocytes, monocytes</li>
<li><strong>Lymphoid line</strong> – B lymphocytes (also T cell precursors before thymus migration)</li>
</ul>
<h4>Histology</h4>
<p>Located in the marrow cavity; made of connective tissue. Includes:</p>
<ul>
<li>Hematopoietic stem cells</li>
<li>Bone marrow stroma</li>
<li>Bone marrow capillary network</li>
<li>Various immune cells</li>
</ul>
<h4>Functions</h4>
<ol>
<li>Produces immune cells: granulocytes, monocytes, B lymphocytes</li>
<li>Acts as a secondary immune organ: contains APCs, stores neutrophils and macrophages for rapid response</li>
<li>Maintains immune balance</li>
</ol>
<div class="clinical-box"><strong>Clinical Note:</strong> Bone marrow dysfunction leads to impaired immune response.</div>
</div>
<div id="thymus">
<h3>4.2 Thymus</h3>
<p>Located just behind the <strong>sternum</strong>; consists of 2 large lobes, each divided into lobules.</p>
<ul>
<li>Develops early from the embryonic period</li>
<li>Largest size (30–50 g) at puberty</li>
<li>Gradually regresses; <15 g in elderly</li>
<li>Does <strong>NOT</strong> directly participate in immune response – only helps T lymphocyte division and differentiation</li>
</ul>
<h4>Gross Anatomy</h4>
<ul>
<li>Surrounded by a fibrous capsule with fibrous septa dividing it into lobules (morphological and functional units)</li>
<li>Divided into: <strong>Cortex</strong> and <strong>Medulla</strong></li>
</ul>
<h4>Thymic Cortex</h4>
<ul>
<li>85–90% of thymus cells</li>
<li>Mainly small, immature lymphocytes (<strong>thymocytes</strong>) with high mitotic rate</li>
<li>T-cell precursors undergoing TCR recombination</li>
<li>Contains epithelial reticular cells (secretory granules stimulate lymphocyte differentiation) and few macrophages</li>
<li><strong>Only ~2–5%</strong> of T cells survive; the rest (~95–98%) are eliminated via apoptosis through <strong>positive selection</strong></li>
</ul>
<h4>Thymic Medulla</h4>
<ul>
<li>Maturation site of immature T lymphocytes</li>
<li>Lower cell density; mainly lymphoblasts and reticular epithelial cells; very few macrophages</li>
<li><strong>No blood-thymus barrier</strong> in the medulla</li>
<li><strong>Hassall's corpuscles</strong>: degenerated reticular epithelial cells forming concentric keratin rings – regulate T lymphocyte differentiation and death</li>
<li><strong>Negative selection</strong>: eliminates T cells that strongly recognize self-antigens (~15–20% eliminated here)</li>
</ul>
<h4>Mature T Lymphocytes in Medulla</h4>
<ul>
<li>Corticosteroid-resistant</li>
<li>Express MHC class I</li>
<li>Express either <strong>CD4</strong> or <strong>CD8</strong> surface antigens</li>
</ul>
<h4>Blood-Thymus Barrier</h4>
<p>Arterial branches form an arterial ring at the cortex-medulla boundary. Creates <strong>immune isolation</strong> — protects immature thymocytes from exposure to foreign antigens, ensuring safe T cell differentiation and selection ("immunological inertia").</p>
<h4>Thymic Endocrine Factors (from Reticular Epithelial Cells)</h4>
<table>
<tr><th>Factor</th><th>Function</th></tr>
<tr><td>Thymotaxin</td><td>Attracts lymphocytes to migrate from blood to thymic cortex</td></tr>
<tr><td>Lymphopoietin</td><td>Induces differentiation of mother cells into lymphocytes/thymocytes</td></tr>
<tr><td>Thymuline</td><td>Promotes synthesis of surface markers (maturation) by lymphocytes</td></tr>
</table>
<h4>Thymus Physiology – Step by Step</h4>
<ol>
<li>T lymphoid precursors generated in medulla via veins → concentrated in superficial cortex</li>
<li>In the <strong>cortex</strong>: active proliferation, antigen-independent differentiation (TCR gene recombination), positive selection (MHC recognition)</li>
<li>In the <strong>medulla</strong>: surviving pre-T cells migrate here → negative selection → become naive T CD4+ or CD8+ cells → enter circulatory system</li>
<li>Then either (1) contact antigens in peripheral lymphoid organs and differentiate, or (2) migrate back to thymic medulla only</li>
</ol>
<div class="highlight-box">
<strong>Why mature T cells only return to the medulla (not cortex):</strong>
<ul>
<li>Lack of early differentiation receptors in the cortex</li>
<li>Lack of receptors necessary to enter the cortex</li>
<li>Avoids disrupting immature T cells and preventing autoimmune diseases</li>
<li>Medulla is more suitable for immune regulatory mechanisms</li>
</ul>
</div>
<h4>Role of Mature Thymocytes in Peripheral Organs</h4>
<ul>
<li><strong>Direct role</strong>: cellular immunity (e.g., graft rejection)</li>
<li><strong>Indirect role</strong>: humoral immunity (coordination with B lymphocytes)</li>
</ul>
<div class="clinical-box">
<strong>Clinical Context – Corticosteroids:</strong>
<ul>
<li>Potent immunosuppressants; induce apoptosis in immune cells including naive T cells</li>
<li>More effective for <strong>acute</strong> inflammation (involving immature/active T cells)</li>
<li>Less effective in <strong>chronic</strong> autoimmune diseases where mature T cells have established function</li>
<li><strong>Congenital immunodeficiency</strong>: deficiency in mature T cells → susceptible to severe infections, less responsive to corticosteroids</li>
<li><strong>HIV patients</strong>: do NOT treat with corticosteroids – virus attacks CD4+ cells</li>
</ul>
</div>
</div>
</div>
<!-- SECTION 5 -->
<div class="section" id="peripheral-organs">
<h2>5. Peripheral Lymphoid Organs</h2>
<div class="highlight-box">
Peripheral lymphoid organs are the <strong>main residence and concentration of lymphocytes and macrophages</strong>. They concentrate antigens, stimulating cell differentiation and division to eliminate antigens.
</div>
<div id="lymph-nodes">
<h3>5.1 Lymph Nodes</h3>
<p>Bean-shaped, covered in connective tissue. Located along lymphatic pathways (neck, armpits, groin). ~600 nodes in the body. Normally <1 cm (not palpable).</p>
<h4>Lymph Fluid</h4>
<ul>
<li>Clear, yellowish fluid; main component is interstitial fluid</li>
<li>Composition: ~95% water, proteins (albumin, globulin), T & B lymphocytes, fats (intestinal lymph = chyle), cellular waste</li>
<li>Journey: small lymphatic vessels → larger vessels (through nodes) → thoracic duct / right lymphatic duct → veins near heart</li>
</ul>
<h4>Lymphatic Vessels</h4>
<ul>
<li><strong>Capillary ends</strong>: thin endothelium forming one-way valves</li>
<li><strong>Afferent vessels</strong>: carry lymph from tissues TO nodes</li>
<li><strong>Efferent vessels</strong>: carry purified lymph FROM nodes to other nodes or back to circulation</li>
<li><strong>Chylothorax</strong> (small intestine): transports absorbed fats</li>
<li><strong>Right lymphatic duct</strong>: receives from upper right body (right arm, head, neck)</li>
<li><strong>Thoracic duct</strong> (left lymphatic duct / canal of van Hoorne): receives from the rest of the body; originates above the chyle sac (~T12)</li>
</ul>
<h4>Structure (Parenchyma – 3 Regions)</h4>
<table>
<tr><th>Region</th><th>Key Features</th></tr>
<tr><td><strong>Cortex</strong></td><td>Spherical lymphoid follicles; mainly B lymphocytes; primary follicles → secondary follicles (with germinal centers) after antigen invasion; thymus-independent</td></tr>
<tr><td><strong>Paracortex</strong></td><td>Many T lymphocytes, few macrophages/B cells; entry point for T & B cells from blood; "thymus-dependent zone"</td></tr>
<tr><td><strong>Medulla</strong></td><td>Marrow cords; T lymphocytes, plasma cells, macrophages; B lymphocytes reproduce and differentiate into plasma cells here; contains lymphatic cavities</td></tr>
</table>
<h4>Immune Response in Lymph Nodes (Step by Step)</h4>
<ol>
<li>Antigens invade → captured by macrophages</li>
<li>Macrophages process and present antigens to T and B cells (APCs)</li>
<li>CD4+ T cells activate in paracortical region → activate B cells in lymphoid follicles</li>
<li>B cells proliferate → plasma cells → antibody production</li>
<li>After days, activated immune cells leave and migrate to expand the response</li>
</ol>
<div class="clinical-box"><strong>Clinical Note:</strong> Lymph nodes enlarge significantly with infection, antigen stimulation, or tumor. They play a defensive role against bacterial invasion and tumor spread.</div>
</div>
<div id="spleen">
<h3>5.2 Spleen</h3>
<p>Largest lymphoid organ in the body, weighing <strong>75–150 g</strong>. Surrounded by connective tissue and peritoneum. Septa divide the parenchyma into compartments.</p>
<h4>Fibrous Capsule</h4>
<p>Contains collagen fibers, elastic fibers, fibrocytes, and few smooth muscle cells – contracts to push blood from spleen to circulatory system. Splenic lymph originates from fibrous septa (not from the hilum).</p>
<h4>White Pulp</h4>
<ul>
<li>Mainly lymphoid tissue with central arterioles</li>
<li>Lymphoid capsules (sheaths) along arterioles</li>
<li>Lymphoid follicles where capsule swells</li>
<li>Region 1: germinal center of B lymphocyte lineage</li>
<li>Region 2: T lymphocytes</li>
</ul>
<h4>Red Pulp (~4/5 of mass)</h4>
<ul>
<li>Filters old red blood cells and dead cell fragments</li>
<li>Contains venous sinuses and lymphocytes</li>
<li>Billroth's cords: macrophages destroy cells using lysosomal enzymes</li>
<li>Spongy structure acts as a blood reserve</li>
</ul>
<h4>Splenic Circulation</h4>
<p>Two hypotheses: <strong>closed circulation</strong> and <strong>open circulation</strong>.</p>
<h4>Splenic Physiology</h4>
<table>
<tr><th>Function</th><th>Details</th></tr>
<tr><td>Lymphocyte generation</td><td>Occurs in white pulp; lymphocytes produced, enter red pulp, then venous sinuses. Embryonic: produces RBC, WBC, platelets, lymphocytes. Postnatal: produces only lymphocytes.</td></tr>
<tr><td>Protection</td><td>Fights foreign invaders via macrophages and antibody production</td></tr>
<tr><td>Destruction of old RBCs</td><td>Occurs in red pulp; macrophages in Billroth's cords use lysosomal enzymes</td></tr>
<tr><td>Blood reservoir</td><td>Spongy red pulp retains blood in venous sinuses; releases when needed</td></tr>
</table>
</div>
<div id="malt">
<h3>5.3 Mucosal-Associated Lymphoid Tissue (MALT)</h3>
<p>Lymphoid tissues <strong>without connective tissue capsule</strong>. Located in mucosa of digestive, respiratory, and urinary tracts.</p>
<h4>GALT (Gut-Associated Lymphoid Tissue)</h4>
<ul>
<li>Includes <strong>Peyer's patches</strong> and scattered lymphoid follicles</li>
<li><strong>Peyer's patches</strong>: characteristic lymphoid structures in the small intestine wall; center: B lymphocytes; surrounding: T lymphocytes (mainly CD8+) and macrophages; processes antigens effectively</li>
</ul>
<h4>BALT (Bronchus-Associated Lymphoid Tissue)</h4>
<ul>
<li>Along trachea, bronchi, bronchioles, and lung lobules</li>
<li>Located just below the respiratory epithelium – allows early contact with new antigens</li>
<li>Less developed than GALT but reacts strongly to inhaled agents (e.g., influenza, SARS-CoV-2)</li>
</ul>
<h4>Waldeyer's Lymphatic Ring (Tonsils)</h4>
<ul>
<li>Consists of lymphocytes, primary and secondary follicles</li>
<li>B lymphocytes account for 40–50%</li>
</ul>
</div>
</div>
<!-- SECTION 6 -->
<div class="section" id="cells">
<h2>6. Cells Involved in Immune Response</h2>
<h3>Innate Immunity Cells</h3>
<p>Provide immediate, non-specific defense. Include:</p>
<ul>
<li><strong>Granulocytes</strong> (neutrophils, eosinophils, basophils/mast cells)</li>
<li><strong>Monocytes / Macrophages</strong> – phagocytosis and antigen presentation</li>
<li><strong>Natural Killer (NK) cells</strong> – kill virus-infected and tumor cells</li>
<li><strong>Dendritic cells</strong> – professional APCs linking innate and adaptive immunity</li>
</ul>
<h3>Adaptive Immunity Cells</h3>
<p>Provide specific, memory-based defense. Include:</p>
<ul>
<li><strong>T lymphocytes (T cells)</strong>
<ul>
<li>CD4+ T helper cells – activate B cells and other immune cells</li>
<li>CD8+ Cytotoxic T cells – directly kill infected/tumor cells</li>
<li>Regulatory T cells (Tregs) – suppress autoimmune responses</li>
</ul>
</li>
<li><strong>B lymphocytes (B cells)</strong> – differentiate into plasma cells to produce antibodies</li>
<li><strong>Plasma cells</strong> – effector B cells producing large amounts of antibody</li>
<li><strong>Memory cells</strong> – long-lived; enable rapid response upon re-exposure</li>
</ul>
<div class="highlight-box">
<strong>Summary Table – Lymphocyte Origin and Maturation</strong>
<table>
<tr><th>Cell Type</th><th>Origin</th><th>Maturation Site</th><th>Function</th></tr>
<tr><td>T lymphocytes</td><td>Bone marrow</td><td>Thymus</td><td>Cellular immunity; help B cells</td></tr>
<tr><td>B lymphocytes</td><td>Bone marrow</td><td>Bone marrow</td><td>Humoral immunity (antibodies)</td></tr>
<tr><td>NK cells</td><td>Bone marrow</td><td>Bone marrow/peripheral</td><td>Innate cytotoxicity</td></tr>
<tr><td>Macrophages</td><td>Bone marrow (monocytes)</td><td>Tissues</td><td>Phagocytosis, antigen presentation</td></tr>
</table>
</div>
</div>
</div>
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</html>
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<header>
<h1>Flashcards</h1>
<p>General Immunology: Cells and Immune Organs | Click a card to reveal the answer</p>
</header>
<div class="category-tabs">
<button class="tab active" onclick="filterCategory('all')">All (40)</button>
<button class="tab" onclick="filterCategory('concepts')">Key Concepts</button>
<button class="tab" onclick="filterCategory('bone-marrow')">Bone Marrow</button>
<button class="tab" onclick="filterCategory('thymus')">Thymus</button>
<button class="tab" onclick="filterCategory('lymph-nodes')">Lymph Nodes</button>
<button class="tab" onclick="filterCategory('spleen')">Spleen</button>
<button class="tab" onclick="filterCategory('malt')">MALT</button>
<button class="tab" onclick="filterCategory('cells')">Immune Cells</button>
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<div class="progress-bar-wrap"><div class="progress-bar" id="progressBar"></div></div>
<div class="counter" id="counter">Card 1 of 40</div>
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<div class="stat stat-know"><span id="knowCount">0</span>Know It</div>
<div class="stat stat-review"><span id="reviewCount">0</span>Review</div>
<div class="stat stat-left"><span id="leftCount">40</span>Remaining</div>
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<div class="card-area">
<div class="card-scene">
<div class="card" id="flashcard" onclick="flipCard()">
<div class="card-face card-front">
<div class="card-label">Question</div>
<div class="card-question" id="cardQuestion"></div>
<div class="card-hint">Click to reveal answer</div>
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<div class="card-face card-back">
<div class="category-badge" id="cardCategory"></div>
<div class="card-label">Answer</div>
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<button class="btn-know" onclick="markCard('know')">✓ Know It</button>
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<button id="prevBtn" onclick="prevCard()">← Previous</button>
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<button id="shuffleBtn" onclick="shuffleCards()">🔀 Shuffle</button>
<button id="resetBtn" onclick="resetCards()">↺ Reset</button>
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// KEY CONCEPTS
{ category: 'concepts', q: 'What is Immunity?', a: 'The body\'s ability to resist pathogens.' },
{ category: 'concepts', q: 'What is the Immune System composed of?', a: 'Immune organs, cells, and molecules secreted by cells (e.g., antibodies).' },
{ category: 'concepts', q: 'What is an Immune Response?', a: 'The immune system\'s response to microorganisms and harmful substances.' },
{ category: 'concepts', q: 'What is Immunology?', a: 'The study of the structure and function of the immune system and the body\'s immune responses.' },
{ category: 'concepts', q: 'Name 4 disorders that arise when the immune system is dysregulated.', a: '1. Immunodeficiency\n2. Chronic inflammation\n3. Autoimmune disease\n4. Graft rejection' },
{ category: 'concepts', q: 'What are the 2 types of lymphoid organs?', a: '1. Central lymphoid organs – produce and train stem cells (antigen-independent)\n2. Peripheral lymphoid organs – concentrate lymphocytes/macrophages; respond to antigens' },
// BONE MARROW
{ category: 'bone-marrow', q: 'What are the 2 main types of bone marrow?', a: 'Red marrow – contains hematopoietic stem cells (active hematopoiesis)\nYellow marrow – contains mainly fat; less involved in hematopoiesis' },
{ category: 'bone-marrow', q: 'What are the 2 hematopoietic cell lines produced in bone marrow?', a: 'Myeloid line (granulocytes, monocytes) and Lymphoid line (B lymphocytes; T cell precursors)' },
{ category: 'bone-marrow', q: 'What 3 functions does bone marrow serve in immunity?', a: '1. Produces immune cells (granulocytes, monocytes, B lymphocytes)\n2. Acts as secondary immune organ (contains APCs; stores neutrophils and macrophages)\n3. Maintains immune balance' },
{ category: 'bone-marrow', q: 'Bone marrow dysfunction leads to what?', a: 'Impaired immune response' },
{ category: 'bone-marrow', q: 'Is bone marrow a classic lymphoid organ?', a: 'No – it is not a classic lymphoid organ, but it is where multipotent stem cells and immunocompetent precursor cells are produced.' },
// THYMUS
{ category: 'thymus', q: 'Where is the thymus located?', a: 'Just behind the sternum; consists of 2 large lobes, each divided into lobules.' },
{ category: 'thymus', q: 'What is the weight of the thymus at puberty vs. in the elderly?', a: 'Puberty: 30–50 g (largest)\nElderly: <15 g (physiological regression)' },
{ category: 'thymus', q: 'What percentage of thymocytes survive positive selection in the cortex?', a: 'Only ~2–5% survive; ~95–98% are eliminated via apoptosis (positive selection).' },
{ category: 'thymus', q: 'What is positive selection in the thymic cortex?', a: 'Elimination of T cells that cannot recognize MHC complexes on thymic epithelial cells – ~95–98% die via apoptosis.' },
{ category: 'thymus', q: 'What is negative selection in the thymic medulla?', a: 'Elimination of T cells that strongly recognize self-antigens – prevents autoimmune reactions. ~15–20% of thymocytes eliminated here.' },
{ category: 'thymus', q: 'What are Hassall\'s corpuscles?', a: 'Degenerated reticular epithelial cells in the thymic medulla, arranged in concentric keratin rings. They regulate T lymphocyte differentiation and death.' },
{ category: 'thymus', q: 'What is the function of the blood-thymus barrier?', a: 'Creates immune isolation – protects immature thymocytes from foreign antigens, ensuring safe T cell differentiation and selection ("immunological inertia").' },
{ category: 'thymus', q: 'What 3 endocrine factors do thymic reticular epithelial cells secrete?', a: '1. Thymotaxin – attracts lymphocytes from blood to cortex\n2. Lymphopoietin – induces differentiation into lymphocytes/thymocytes\n3. Thymuline – promotes surface marker synthesis (maturation)' },
{ category: 'thymus', q: 'What surface antigens do mature T lymphocytes in the thymic medulla express?', a: 'MHC class I, and either CD4 or CD8' },
{ category: 'thymus', q: 'Why do mature T cells only return to the thymic medulla and NOT the cortex?', a: '1. Lack of early differentiation receptors in the cortex\n2. Lack of receptors to enter the cortex\n3. Avoids disrupting immature T cells / preventing autoimmune disease\n4. Medulla is more suitable for immune regulatory mechanisms' },
{ category: 'thymus', q: 'Why should corticosteroids NOT be used in HIV patients?', a: 'HIV attacks CD4+ T cells; corticosteroids would further suppress these cells, worsening immune deficiency.' },
{ category: 'thymus', q: 'What are the 2 roles of mature thymocytes in peripheral lymphoid organs?', a: 'Direct role: cellular immunity (e.g., graft rejection)\nIndirect role: humoral immunity (coordination with B lymphocytes)' },
// LYMPH NODES
{ category: 'lymph-nodes', q: 'How many lymph nodes are in the human body, and what is their normal size?', a: 'About 600 lymph nodes; normally <1 cm (not palpable).' },
{ category: 'lymph-nodes', q: 'What are the 3 regions of the lymph node parenchyma?', a: '1. Cortex – B lymphocytes, lymphoid follicles (primary → secondary with germinal centers)\n2. Paracortex – T lymphocytes; "thymus-dependent zone"\n3. Medulla – plasma cells, macrophages; B cells differentiate into plasma cells here' },
{ category: 'lymph-nodes', q: 'What is the "thymus-dependent zone" of a lymph node?', a: 'The paracortical region – contains mainly T lymphocytes and is where T and B cells from blood enter the lymph node.' },
{ category: 'lymph-nodes', q: 'What happens to lymphoid follicles in the cortex when antigens invade?', a: 'Primary lymphoid follicles expand, germinal centers appear, and they become secondary lymphoid follicles.' },
{ category: 'lymph-nodes', q: 'Describe the step-by-step immune response in a lymph node.', a: '1. Antigens captured by macrophages\n2. Macrophages process/present antigens to T and B cells\n3. CD4+ T cells activate in paracortex → activate B cells in follicles\n4. B cells proliferate → plasma cells → antibodies\n5. Activated cells leave lymph nodes after a few days' },
{ category: 'lymph-nodes', q: 'What is the right lymphatic duct vs. the thoracic duct?', a: 'Right lymphatic duct: drains upper right body (right arm, right head/neck)\nThoracic duct (left lymphatic duct): drains the rest of the body; originates ~T12' },
{ category: 'lymph-nodes', q: 'What is chyle?', a: 'Lymph fluid in the intestine that contains a lot of fat absorbed from food.' },
// SPLEEN
{ category: 'spleen', q: 'What is the weight of the spleen and what are its 2 main parenchymal regions?', a: 'Weight: 75–150 g\n1. Red pulp (~4/5 of mass) – filters old RBCs; blood reservoir\n2. White pulp – lymphoid tissue; site of immune responses' },
{ category: 'spleen', q: 'What is the function of the white pulp of the spleen?', a: 'Contains lymphoid tissue with central arterioles; lymphoid follicles with germinal centers (B cells) and T lymphocyte zones. Site of lymphocyte production and immune activation.' },
{ category: 'spleen', q: 'What is the function of the red pulp of the spleen?', a: 'Filters old red blood cells and dead cell fragments (via macrophages in Billroth\'s cords using lysosomal enzymes); also serves as a blood reservoir.' },
{ category: 'spleen', q: 'What are the 4 main physiological functions of the spleen?', a: '1. Lymphocyte generation\n2. Protection (fight pathogens via macrophages and antibodies)\n3. Destruction of old RBCs\n4. Blood reservoir' },
{ category: 'spleen', q: 'In the embryonic period, what does the spleen produce?', a: 'Red blood cells, white blood cells, platelets, and lymphocytes. Postnatally, it produces only lymphocytes.' },
// MALT
{ category: 'malt', q: 'What distinguishes MALT from other lymphoid organs structurally?', a: 'MALT lacks a connective tissue capsule. It is found in the mucosa of the digestive, respiratory, and urinary tracts.' },
{ category: 'malt', q: 'What are Peyer\'s patches and where are they located?', a: 'Characteristic lymphoid structures in the small intestine wall. Center: B lymphocytes; Surrounding: T lymphocytes (mainly CD8+) and macrophages. Effectively process antigens.' },
{ category: 'malt', q: 'What is BALT and what makes it clinically important?', a: 'Bronchus-Associated Lymphoid Tissue – along trachea, bronchi, bronchioles. Located just below respiratory epithelium for early antigen contact. Reacts strongly to inhaled agents (e.g., influenza, SARS-CoV-2).' },
{ category: 'malt', q: 'What are the tonsils and what is the composition of Waldeyer\'s lymphatic ring?', a: 'Waldeyer\'s ring: lymphocytes, primary and secondary follicles. B lymphocytes account for 40–50%.' },
// IMMUNE CELLS
{ category: 'cells', q: 'Where do T lymphocytes originate and where do they mature?', a: 'Originate in bone marrow; mature in the THYMUS.' },
{ category: 'cells', q: 'Where do B lymphocytes originate and where do they mature?', a: 'Originate AND mature in the BONE MARROW.' },
{ category: 'cells', q: 'What is the difference between CD4+ and CD8+ T cells?', a: 'CD4+ T helper cells – activate B cells and coordinate immune responses\nCD8+ Cytotoxic T cells – directly kill virus-infected or tumor cells' },
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Writing File
~/immunology-lesson1/quiz.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Quiz – General Immunology: Cells and Immune Organs</title>
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</head>
<body>
<header>
<h1>Quiz</h1>
<p>General Immunology: Cells and Immune Organs | Test your knowledge</p>
</header>
<div class="container">
<!-- START SCREEN -->
<div id="startScreen">
<h2>Ready to Test Yourself?</h2>
<p>30 questions covering all topics from Lesson 1. Choose how many questions and a topic focus.</p>
<div style="margin-bottom:18px;">
<p style="font-weight:700;color:#1a3c5e;margin-bottom:10px;">Number of Questions:</p>
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<button onclick="setCount(20)">20 Questions</button>
<button onclick="setCount(30)">All 30</button>
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<button onclick="setTopic('all')" class="active">All Topics</button>
<button onclick="setTopic('concepts')">Key Concepts</button>
<button onclick="setTopic('bone-marrow')">Bone Marrow</button>
<button onclick="setTopic('thymus')">Thymus</button>
<button onclick="setTopic('lymph-nodes')">Lymph Nodes</button>
<button onclick="setTopic('spleen')">Spleen</button>
<button onclick="setTopic('malt')">MALT</button>
<button onclick="setTopic('cells')">Immune Cells</button>
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<div class="grade-sub" id="gradeSub"></div>
<div class="result-stats">
<div class="result-stat r-correct"><div class="val" id="rCorrect"></div><div class="lbl">Correct</div></div>
<div class="result-stat r-wrong"><div class="val" id="rWrong"></div><div class="lbl">Incorrect</div></div>
<div class="result-stat r-total"><div class="val" id="rTotal"></div><div class="lbl">Total</div></div>
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<div class="result-btns">
<button class="btn-retry" onclick="retryQuiz()">↺ Retry Quiz</button>
<button class="btn-wrong-only" onclick="retryWrong()">Review Wrong Answers</button>
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<div class="review-section" id="reviewSection"></div>
</div>
</div>
<script>
const allQuestions = [
// KEY CONCEPTS
{ category: 'concepts', q: 'What is the definition of "Immunity"?', options: ['The body\'s ability to resist pathogens', 'The set of immune organs and molecules', 'The study of immune system structure', 'The response to harmful environmental chemicals'], correct: 0, explanation: 'Immunity is specifically defined as the body\'s ability to resist pathogens.' },
{ category: 'concepts', q: 'Which of the following best describes the "Immune System"?', options: ['Only immune cells in the bloodstream', 'Immune organs, cells, and molecules secreted by cells (e.g., antibodies)', 'Antibodies and complement proteins only', 'The lymphatic system and lymph nodes'], correct: 1, explanation: 'The immune system includes immune organs, cells, AND molecules secreted by cells (such as antibodies).' },
{ category: 'concepts', q: 'Which of the following is NOT a consequence of immune system dysregulation?', options: ['Autoimmune disease', 'Immunodeficiency', 'Hypertension', 'Graft rejection'], correct: 2, explanation: 'Hypertension is a cardiovascular condition, not a direct result of immune dysregulation. The immune disorders include immunodeficiency, chronic inflammation, autoimmune disease, and graft rejection.' },
{ category: 'concepts', q: 'Which type of lymphoid organ trains stem cells into mature cells WITHOUT requiring antigens?', options: ['Peripheral lymphoid organs', 'Central lymphoid organs', 'Spleen', 'Lymph nodes'], correct: 1, explanation: 'Central lymphoid organs (bone marrow and thymus) produce and train stem cells into mature immune cells in an antigen-independent manner.' },
// BONE MARROW
{ category: 'bone-marrow', q: 'Which type of bone marrow contains hematopoietic stem cells?', options: ['Yellow marrow', 'Cortical marrow', 'Red marrow', 'Trabecular marrow'], correct: 2, explanation: 'Red marrow contains hematopoietic stem cells and is actively involved in blood cell production. Yellow marrow contains mainly fat.' },
{ category: 'bone-marrow', q: 'Which of the following immune cells is NOT produced primarily in bone marrow from the myeloid lineage?', options: ['Granulocytes', 'Monocytes', 'T lymphocytes (mature)', 'Neutrophils'], correct: 2, explanation: 'T lymphocytes originate in bone marrow but MATURE in the thymus. Granulocytes, monocytes, and neutrophils are myeloid-lineage cells that mature in bone marrow.' },
{ category: 'bone-marrow', q: 'What is the consequence of bone marrow dysfunction?', options: ['Enhanced immune response', 'Impaired immune response', 'Only affects red blood cell production', 'Causes autoimmune disease exclusively'], correct: 1, explanation: 'Bone marrow dysfunction leads to impaired immune response because it is the primary source of all immune cells.' },
{ category: 'bone-marrow', q: 'What secondary immune function does bone marrow serve?', options: ['Site of T cell negative selection', 'Contains APCs that help activate immune responses; stores neutrophils and macrophages', 'Produces only B lymphocytes', 'Acts as a blood filter like the spleen'], correct: 1, explanation: 'Bone marrow acts as a secondary immune organ by containing antigen-presenting cells (APCs) and storing large numbers of neutrophils and macrophages for rapid response.' },
// THYMUS
{ category: 'thymus', q: 'When does the thymus reach its maximum size, and what is that maximum weight?', options: ['At birth; 10-15 g', 'At puberty; 30-50 g', 'In early childhood; 20-25 g', 'In elderly; <15 g'], correct: 1, explanation: 'The thymus reaches its maximum size at puberty, weighing 30-50 g, and then gradually regresses to <15 g in the elderly.' },
{ category: 'thymus', q: 'What percentage of T cells survive positive selection in the thymic cortex?', options: ['50-60%', '30-40%', '15-20%', '~2-5%'], correct: 3, explanation: 'Only about 2-5% of T cells survive positive selection in the cortex. The remaining 95-98% are eliminated via apoptosis.' },
{ category: 'thymus', q: 'What is the purpose of NEGATIVE selection in the thymic medulla?', options: ['To select T cells that recognize MHC molecules', 'To eliminate T cells that strongly recognize self-antigens, preventing autoimmunity', 'To produce mature B lymphocytes', 'To create Hassall\'s corpuscles'], correct: 1, explanation: 'Negative selection eliminates T cells with too high an affinity for self-antigens, which prevents autoimmune reactions. About 15-20% of thymocytes are eliminated in this phase.' },
{ category: 'thymus', q: 'What are Hassall\'s corpuscles?', options: ['Germinal centers in the thymic cortex', 'Degenerated reticular epithelial cells forming concentric keratin rings in the medulla', 'Blood-thymus barrier components', 'Primary lymphoid follicles in the thymus'], correct: 1, explanation: 'Hassall\'s corpuscles are degenerated reticular epithelial cells that form concentric keratin rings in the thymic medulla. They regulate T lymphocyte differentiation and death.' },
{ category: 'thymus', q: 'Which thymic endocrine factor attracts lymphocytes to migrate from blood to the thymic cortex?', options: ['Lymphopoietin', 'Thymuline', 'Thymotaxin', 'Interleukin-7'], correct: 2, explanation: 'Thymotaxin (a tropic peptide) causes lymphocytes to migrate from the blood to the thymic cortex. Lymphopoietin induces differentiation; thymuline promotes surface marker synthesis.' },
{ category: 'thymus', q: 'What is the blood-thymus barrier and where is it located?', options: ['A barrier in the thymic medulla separating T cells from B cells', 'An arterial ring at the cortex-medulla boundary that protects immature thymocytes from foreign antigens', 'The fibrous capsule surrounding the thymus', 'The basement membrane of thymic cortical epithelial cells'], correct: 1, explanation: 'The blood-thymus barrier is an arterial ring at the boundary between the cortex and medulla. It creates immune isolation, protecting immature thymocytes from premature antigen exposure.' },
{ category: 'thymus', q: 'Why should corticosteroids NOT be used in HIV patients?', options: ['HIV makes patients resistant to corticosteroids', 'Corticosteroids activate HIV replication directly', 'HIV attacks CD4+ T cells; corticosteroids would further suppress these cells', 'HIV causes excessive corticosteroid production'], correct: 2, explanation: 'HIV specifically attacks CD4+ T cells. Administering corticosteroids, which induce apoptosis in immune cells including T cells, would further deplete the already-reduced CD4+ population.' },
{ category: 'thymus', q: 'Surface markers of mature T lymphocytes in the thymic medulla include:', options: ['MHC class II and CD3', 'MHC class I and either CD4 or CD8', 'CD19 and CD20', 'IgM and IgD'], correct: 1, explanation: 'Mature T lymphocytes in the medulla are corticosteroid-resistant and express MHC class I along with either CD4 or CD8 antigens.' },
{ category: 'thymus', q: 'Why do mature T cells return ONLY to the thymic medulla and NOT the cortex?', options: ['The cortex is too crowded with new T cells', 'Mature T cells lack receptors to enter the cortex; returning would disrupt immature T cells and risk autoimmune disease', 'The cortex has a blood-thymus barrier blocking mature cells', 'Corticosteroids prevent mature T cells from entering the cortex'], correct: 1, explanation: 'Mature T cells lack early differentiation receptors and the receptors necessary to enter the cortex. Entering the cortex could disrupt immature T cell selection and risk autoimmune disease.' },
// LYMPH NODES
{ category: 'lymph-nodes', q: 'Which region of the lymph node is the "thymus-dependent zone"?', options: ['Cortex', 'Germinal center', 'Paracortex', 'Medullary cords'], correct: 2, explanation: 'The paracortical region is called the thymus-dependent zone because it is populated by T lymphocytes and is where T and B cells from blood enter the lymph node.' },
{ category: 'lymph-nodes', q: 'Where in the lymph node do B cells differentiate into plasma cells?', options: ['Paracortex', 'Primary follicles', 'Medullary region', 'Subcapsular sinus'], correct: 2, explanation: 'The medullary region is where B lymphocytes reproduce and differentiate into plasma cells, which then produce antibodies.' },
{ category: 'lymph-nodes', q: 'What structural change occurs in lymphoid follicles when antigens invade?', options: ['Primary follicles shrink and disappear', 'Primary follicles expand, germinal centers appear, and they become secondary follicles', 'T cells replace B cells in the follicles', 'The follicles migrate to the paracortex'], correct: 1, explanation: 'When antigens invade, primary lymphoid follicles expand, germinal centers appear, and they transform into secondary lymphoid follicles.' },
{ category: 'lymph-nodes', q: 'Which lymphatic duct drains the upper RIGHT side of the body?', options: ['Thoracic duct', 'Left lymphatic duct', 'Right lymphatic duct', 'Canal of van Hoorne'], correct: 2, explanation: 'The right lymphatic duct receives fluid from the upper right body: right upper body, right arm, right head, and neck. The thoracic duct drains the rest of the body.' },
{ category: 'lymph-nodes', q: 'What is "chyle"?', options: ['Lymph fluid in the pleural cavity', 'Lymph fluid in the intestine that contains high amounts of absorbed fat', 'Clear fluid produced by the spleen', 'Protein-rich fluid in lymph nodes'], correct: 1, explanation: 'Chyle is the specialized lymph fluid in the intestine that contains a lot of fat absorbed from food. It is transported by lacteals (chylothorax).' },
// SPLEEN
{ category: 'spleen', q: 'What is the approximate weight of the spleen?', options: ['15-30 g', '50-75 g', '75-150 g', '150-250 g'], correct: 2, explanation: 'The spleen weighs approximately 75-150 g and is the largest lymphoid organ in the body.' },
{ category: 'spleen', q: 'What proportion of the spleen is made up of red pulp?', options: ['1/5', '2/5', '3/5', '4/5'], correct: 3, explanation: 'Red pulp constitutes approximately 4/5 of the splenic mass; white pulp is scattered within the red pulp.' },
{ category: 'spleen', q: 'Where in the spleen are old red blood cells destroyed?', options: ['White pulp germinal centers', 'Billroth\'s cords in the red pulp (by macrophages using lysosomal enzymes)', 'Central arterioles', 'Fibrous capsule'], correct: 1, explanation: 'Macrophages in Billroth\'s cords of the red pulp destroy old red blood cells using lysosomal enzymes.' },
{ category: 'spleen', q: 'During the embryonic period, the spleen produces:', options: ['Only lymphocytes', 'Only red blood cells', 'Red blood cells, white blood cells, platelets, and lymphocytes', 'Only B lymphocytes and plasma cells'], correct: 2, explanation: 'In the embryonic period, the spleen produces red blood cells, white blood cells, platelets, and lymphocytes. After birth, it produces only lymphocytes.' },
{ category: 'spleen', q: 'What is the function of the spongy structure of the red pulp?', options: ['Filters antigens and presents them to T cells', 'Stores blood in venous sinuses and releases it when needed (blood reservoir)', 'Produces erythropoietin', 'Generates germinal centers for B cell activation'], correct: 1, explanation: 'The spongy structure of the red pulp keeps blood in the venous sinuses, acting as a blood reservoir, and releases it when needed to increase blood volume.' },
// MALT
{ category: 'malt', q: 'What distinguishes MALT from other lymphoid organs?', options: ['It is located only in the gut', 'It has a thick fibrous capsule', 'It lacks a connective tissue capsule', 'It contains only T lymphocytes'], correct: 2, explanation: 'MALT (Mucosal-Associated Lymphoid Tissue) is distinguished from other lymphoid organs by the absence of a connective tissue capsule.' },
{ category: 'malt', q: 'What is the predominant T cell type in the area SURROUNDING Peyer\'s patches?', options: ['CD4+ T helper cells', 'Regulatory T cells', 'CD8+ T cells and macrophages', 'NK cells'], correct: 2, explanation: 'In Peyer\'s patches, the center contains B lymphocytes while the surrounding area contains mainly CD8+ T cells and macrophages.' },
{ category: 'malt', q: 'Which mucosal lymphoid tissue responds strongly to SARS-CoV-2 and influenza?', options: ['GALT (Peyer\'s patches)', 'BALT (Bronchus-Associated Lymphoid Tissue)', 'Waldeyer\'s ring only', 'Mesenteric lymph nodes'], correct: 1, explanation: 'BALT is located just below the respiratory epithelium and reacts strongly to inhaled agents such as influenza and SARS-CoV-2, although it is less developed than GALT.' },
{ category: 'malt', q: 'What percentage of cells in Waldeyer\'s lymphatic ring (tonsils) are B lymphocytes?', options: ['5-10%', '20-30%', '40-50%', '60-70%'], correct: 2, explanation: 'B lymphocytes account for 40-50% of cells in Waldeyer\'s lymphatic ring.' },
// IMMUNE CELLS
{ category: 'cells', q: 'Which cell type bridges innate and adaptive immunity by acting as professional antigen-presenting cells?', options: ['Neutrophils', 'Mast cells', 'NK cells', 'Dendritic cells'], correct: 3, explanation: 'Dendritic cells are professional antigen-presenting cells (APCs) that link the innate and adaptive immune systems by capturing antigens and presenting them to T cells.' },
{ category: 'cells', q: 'What is the difference between the maturation sites of T and B lymphocytes?', options: ['Both mature in the thymus', 'T cells mature in bone marrow; B cells in thymus', 'T cells mature in the thymus; B cells mature in bone marrow', 'Both mature in peripheral lymphoid organs'], correct: 2, explanation: 'T lymphocytes originate in bone marrow and mature in the thymus. B lymphocytes both originate AND mature in the bone marrow.' },
];
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else if (pct >= 60) { grade = '📚 Keep Studying'; sub = 'You\'re on the right track. Focus on your weak areas.'; }
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