A handwritten-style educational diagram on white lined paper showing Type II Hypersensitivity Reaction mechanism. The diagram should look like neat student notes with hand-drawn arrows, bubbles, and boxes, written in blue ink on ruled paper. Layout (top to bottom, flowing diagram): TITLE at top: "Type II Hypersensitivity Reaction (Cytotoxic Type)" in large handwritten letters, underlined. Section 1 - TRIGGER (circled bubble): "RBCs have intrinsic Antigens on their surface" Arrow down labeled "What happens?" Section 2 - ANTIBODY BINDING (box): "IgG / IgM Antibodies bind to Fc region of Ag on cell surface" Small drawing of a cell with Y-shaped antibodies attached to surface Section 3 - COMPLEMENT ACTIVATION (flowing arrows): Arrow down → "IgG/IgM activated" Arrow down → "B-cells & T-cells get activated" Arrow down → "Production of IgG/IgM" Arrow down → "IgG/IgM activates Complement System" Section 4 - COMPLEMENT CASCADE (branching diagram): Large circle labeled "C3" with arrow → "C3b" "C1, C2 adapted → gets bound to Fc region of Ab" "Then all are activated" "Cleavage of C3 → C3a + C3b" "Cleavage of C5 → C5a + C5b" "C5b, C6, C7, C8, C9 → MAC (Membrane Attack Complex)" Branch left: "C3a, C5a → attract Neutrophils" "They are cytotoxic to cells" "Tissue damage" "Autoimmune reactions" Section 5 - OUTCOMES (two columns with arrows): Left: "ADCC (Ab-Dependent Cellular Cytotoxicity)" Right: "Complement-mediated lysis" "Neutrophil & phagocyte activation" Section 6 - EXAMPLES (cloud-shaped bubble): "Examples:" "→ Rheumatic fever (Streptococcal)" "→ Erythroblastosis fetalis" "→ Autoimmune hemolytic anemia" "Type II = Hypersensitivity Rxn" "Also known as Immune-Complex mediated" Bottom note in small writing: "Ab → Antigen on cell surface → complement → cytotoxic damage" Style: realistic handwritten blue ballpoint pen on white ruled notebook paper, neat but casual student notes, mix of cursive and print, small hand-drawn cell diagrams with circles and Y-shaped antibodies, arrows connecting all steps, some words circled or boxed for emphasis

A detailed scientific hand-drawn style diagrammatic scheme of Type II Hypersensitivity (Cytotoxic) Reaction on white background. The diagram should be visual and illustrative like a textbook figure with labeled drawings, NOT text notes. The diagram flows top to bottom with visual elements: TOP LEFT: A red blood cell (biconcave disc shape, labeled "RBC / Target Cell") with small square antigens drawn on its surface, labeled "Cell-surface Antigens (intrinsic)" STEP 1: Y-shaped IgG and IgM antibodies drawn attaching to the antigens on the RBC surface. Label: "IgG / IgM bind to cell-surface Ag". Arrow pointing down. STEP 2: Complement Activation pathway drawn as a cascade: - Draw C1 protein docking on the antibody Fc region - Arrow → C1 activates C2, C4 → drawn as small labeled protein blobs - Arrow → C3 drawn as a large protein being cleaved into C3a (small fragment floating away with label "Anaphylatoxin") and C3b (larger fragment attaching to cell surface, labeled "Opsonin") - Arrow → C5 cleaved into C5a (floating away, labeled "Chemotaxin - attracts Neutrophils") and C5b (attaching to membrane) - C5b + C6 + C7 + C8 + C9 assembling into a ring/pore structure on the cell membrane, labeled "MAC - Membrane Attack Complex" CENTER RIGHT: Draw a Neutrophil (multi-lobed nucleus cell) being attracted by C5a arrow, labeled "Neutrophil" Arrow from Neutrophil to RBC: "Releases toxic enzymes → Cell Lysis" BOTTOM CENTER: Three outcome boxes connected by arrows: Box 1 (drawn with cell explosion): "Complement-mediated Lysis" - show RBC bursting with jagged lines Box 2 (drawn with phagocyte engulfing): "Phagocytosis (C3b opsonization)" - show macrophage engulfing opsonized cell Box 3 (drawn with NK cell): "ADCC - NK cell killing via Fc receptor" BOTTOM: Two example disease labels in rounded boxes: "Erythroblastosis Fetalis" and "Rheumatic Fever / Autoimmune Hemolytic Anemia" Style: Clean hand-drawn scientific illustration style, like a medical textbook diagram drawn by hand. Use blue and red ink colors. All structures clearly labeled with lines pointing to them. Arrows show direction of reaction flow. Cells and proteins drawn as recognizable shapes not just text.