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      // Title
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        children: [
          new TextRun({
            text: "Question 7: Explain Why (Any Five)",
            bold: true,
            size: 32,
            font: "Times New Roman",
          })
        ],
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        children: [
          new TextRun({
            text: "SET A",
            bold: true,
            size: 28,
            font: "Times New Roman",
            underline: {}
          })
        ],
        spacing: { after: 400 }
      }),

      // Q a
      new Paragraph({
        children: [new TextRun({ text: "a) Autonomic denervation of heart increases the heart rate.", bold: true, size: 24, font: "Times New Roman" })],
        spacing: { before: 200, after: 100 }
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      new Paragraph({
        children: [new TextRun({
          text: "The heart receives both sympathetic (acceleratory) and parasympathetic (inhibitory) innervation. Under normal resting conditions, the parasympathetic (vagal) tone dominates, keeping the heart rate lower than its intrinsic rate. The sinoatrial (SA) node, which acts as the natural pacemaker of the heart, has an intrinsic firing rate of approximately 100-110 beats per minute.",
          size: 24, font: "Times New Roman"
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        spacing: { after: 100 }
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      new Paragraph({
        children: [new TextRun({
          text: "When the heart is autonomically denervated (e.g., in a cardiac transplant or due to diabetic autonomic neuropathy), the inhibitory vagal tone is removed. As a result, the SA node fires at its intrinsic, faster rate. This is why autonomic denervation leads to an increase in resting heart rate - a phenomenon well documented in transplanted hearts, where the donor heart is fully denervated and exhibits a resting tachycardia of around 100-110 bpm.",
          size: 24, font: "Times New Roman"
        })],
        spacing: { after: 300 }
      }),

      // Q b
      new Paragraph({
        children: [new TextRun({ text: "b) Diuretics are used for treatment of Hypertension.", bold: true, size: 24, font: "Times New Roman" })],
        spacing: { before: 200, after: 100 }
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        children: [new TextRun({
          text: "Hypertension results from increased blood volume and/or increased peripheral vascular resistance. Diuretics reduce blood pressure through the following mechanisms:",
          size: 24, font: "Times New Roman"
        })],
        spacing: { after: 100 }
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      new Paragraph({
        children: [new TextRun({ text: "1. Reduction of blood volume: ", bold: true, size: 24, font: "Times New Roman" }, ), new TextRun({ text: "Diuretics (especially thiazides) act on the renal tubules to inhibit sodium and water reabsorption. This leads to increased urinary excretion of sodium and water, reducing the extracellular fluid volume and consequently cardiac output.", size: 24, font: "Times New Roman" })],
        spacing: { after: 80 }
      }),
      new Paragraph({
        children: [new TextRun({ text: "2. Reduction of peripheral resistance: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "With prolonged use, thiazide diuretics also cause vasodilation by reducing intracellular sodium in vascular smooth muscle cells, decreasing their responsiveness to vasoconstrictors.", size: 24, font: "Times New Roman" })],
        spacing: { after: 80 }
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      new Paragraph({
        children: [new TextRun({ text: "Thiazide diuretics (e.g., hydrochlorothiazide) are the first-line choice for uncomplicated hypertension. Loop diuretics (e.g., furosemide) are used when hypertension is accompanied by heart failure or renal impairment. Potassium-sparing diuretics serve as adjuncts to prevent hypokalemia.", size: 24, font: "Times New Roman" })],
        spacing: { after: 300 }
      }),

      // Q c
      new Paragraph({
        children: [new TextRun({ text: "c) Packed cell volume (PCV) is higher in high altitude residents.", bold: true, size: 24, font: "Times New Roman" })],
        spacing: { before: 200, after: 100 }
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      new Paragraph({
        children: [new TextRun({
          text: "At high altitudes, the partial pressure of oxygen (pO2) in the atmosphere is significantly reduced (hypobaric hypoxia). This leads to decreased oxygen saturation in the blood. The body responds through several compensatory mechanisms, the most important of which involves the kidneys:",
          size: 24, font: "Times New Roman"
        })],
        spacing: { after: 100 }
      }),
      new Paragraph({
        children: [new TextRun({ text: "- ", size: 24, font: "Times New Roman" }), new TextRun({ text: "Hypoxia stimulates the juxtaglomerular cells of the kidney to secrete erythropoietin (EPO).", size: 24, font: "Times New Roman" })],
        spacing: { after: 60 }
      }),
      new Paragraph({
        children: [new TextRun({ text: "- ", size: 24, font: "Times New Roman" }), new TextRun({ text: "EPO stimulates the bone marrow to increase red blood cell (RBC) production - a process called polycythemia.", size: 24, font: "Times New Roman" })],
        spacing: { after: 60 }
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      new Paragraph({
        children: [new TextRun({ text: "- ", size: 24, font: "Times New Roman" }), new TextRun({ text: "The increase in RBC count raises the hematocrit (packed cell volume - the percentage of RBCs in total blood volume).", size: 24, font: "Times New Roman" })],
        spacing: { after: 100 }
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      new Paragraph({
        children: [new TextRun({
          text: "This is an adaptive mechanism to increase the oxygen-carrying capacity of the blood in an environment where each breath delivers less oxygen. Long-term residents of high-altitude areas (e.g., residents of the Andes or Himalayas) typically have PCV values significantly higher than sea-level populations.",
          size: 24, font: "Times New Roman"
        })],
        spacing: { after: 300 }
      }),

      // Q d
      new Paragraph({
        children: [new TextRun({ text: "d) Alcohol intoxication can be avoided if it is consumed after a fat-rich diet.", bold: true, size: 24, font: "Times New Roman" })],
        spacing: { before: 200, after: 100 }
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        children: [new TextRun({
          text: "Alcohol (ethanol) is primarily absorbed from the stomach and small intestine. The rate and extent of absorption determines the blood alcohol concentration (BAC) and the degree of intoxication. A fat-rich meal before or during alcohol consumption delays intoxication through the following mechanisms:",
          size: 24, font: "Times New Roman"
        })],
        spacing: { after: 100 }
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      new Paragraph({
        children: [new TextRun({ text: "1. Delayed gastric emptying: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "Fat is a potent stimulant for the release of cholecystokinin (CCK), which slows gastric emptying. Since alcohol is most rapidly absorbed from the small intestine, delayed gastric emptying means alcohol reaches the absorptive surface more slowly.", size: 24, font: "Times New Roman" })],
        spacing: { after: 80 }
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      new Paragraph({
        children: [new TextRun({ text: "2. Dilution of alcohol: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "Food in the stomach dilutes the alcohol concentration, reducing the concentration gradient driving absorption.", size: 24, font: "Times New Roman" })],
        spacing: { after: 80 }
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      new Paragraph({
        children: [new TextRun({ text: "3. Enhanced first-pass metabolism: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "Slower absorption allows more time for gastric alcohol dehydrogenase to metabolize alcohol in the stomach before it enters systemic circulation.", size: 24, font: "Times New Roman" })],
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      new Paragraph({
        children: [new TextRun({
          text: "All of these effects combine to reduce the peak BAC, thereby preventing or reducing acute intoxication.",
          size: 24, font: "Times New Roman"
        })],
        spacing: { after: 300 }
      }),

      // Q e
      new Paragraph({
        children: [new TextRun({ text: "e) Premature neonates are prone to Respiratory Distress Syndrome (RDS).", bold: true, size: 24, font: "Times New Roman" })],
        spacing: { before: 200, after: 100 }
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        children: [new TextRun({
          text: "Respiratory Distress Syndrome (RDS), also known as Hyaline Membrane Disease, is primarily a disease of prematurity. It occurs because premature neonates lack adequate pulmonary surfactant.",
          size: 24, font: "Times New Roman"
        })],
        spacing: { after: 100 }
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      new Paragraph({
        children: [new TextRun({ text: "Role of surfactant: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "Surfactant is a complex mixture of phospholipids and proteins (mainly dipalmitoylphosphatidylcholine - DPPC) produced by Type II alveolar epithelial (pneumocyte) cells. It reduces alveolar surface tension, preventing alveolar collapse at the end of expiration.", size: 24, font: "Times New Roman" })],
        spacing: { after: 80 }
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      new Paragraph({
        children: [new TextRun({ text: "Development: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "Surfactant production begins around 24-28 weeks of gestation and reaches adequate levels by approximately 34-36 weeks. Infants born before 34 weeks have insufficient surfactant.", size: 24, font: "Times New Roman" })],
        spacing: { after: 80 }
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      new Paragraph({
        children: [new TextRun({ text: "Consequences: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "Without surfactant, alveoli collapse at end-expiration (atelectasis), lung compliance is reduced, and the infant must work much harder to breathe. This leads to rapid, labored breathing, hypoxia, and hypercapnia - the hallmarks of RDS.", size: 24, font: "Times New Roman" })],
        spacing: { after: 100 }
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      new Paragraph({
        children: [new TextRun({
          text: "Treatment includes exogenous surfactant replacement therapy and nasal continuous positive airway pressure (CPAP). Antenatal corticosteroids given to the mother accelerate fetal lung maturation and surfactant production.",
          size: 24, font: "Times New Roman"
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        spacing: { after: 300 }
      }),

      // Q f
      new Paragraph({
        children: [new TextRun({ text: "f) Tuberculosis is common in the apex of the lungs.", bold: true, size: 24, font: "Times New Roman" })],
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          text: "Mycobacterium tuberculosis, the causative agent of tuberculosis (TB), has a strict aerobic metabolism and thrives in high-oxygen environments. The apex (upper lobe) of the lungs provides conditions ideal for mycobacterial growth:",
          size: 24, font: "Times New Roman"
        })],
        spacing: { after: 100 }
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      new Paragraph({
        children: [new TextRun({ text: "1. Higher oxygen tension (pO2): ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "In the upright position, the apex receives a greater ventilation-to-perfusion (V/Q) ratio compared to the base. Ventilation is relatively higher than perfusion at the apex, resulting in higher alveolar pO2, which favors the growth of obligate aerobic M. tuberculosis.", size: 24, font: "Times New Roman" })],
        spacing: { after: 80 }
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        children: [new TextRun({ text: "2. Reduced lymphatic drainage: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "The apical region has relatively poor lymphatic clearance, making it harder for the immune system to clear organisms that lodge there.", size: 24, font: "Times New Roman" })],
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      new Paragraph({
        children: [new TextRun({ text: "3. Lower blood flow (in secondary TB): ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "The apex receives less blood flow, meaning fewer immune cells are delivered to fight the infection.", size: 24, font: "Times New Roman" })],
        spacing: { after: 100 }
      }),
      new Paragraph({
        children: [new TextRun({
          text: "This is why secondary (reactivation) pulmonary tuberculosis classically involves the apex of the upper lobes. The primary (Ghon) focus can occur anywhere, but reactivation TB is characteristically apical.",
          size: 24, font: "Times New Roman"
        })],
        spacing: { after: 600 }
      }),

      // SET B heading
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        alignment: AlignmentType.CENTER,
        children: [
          new TextRun({
            text: "SET B",
            bold: true,
            size: 28,
            font: "Times New Roman",
            underline: {}
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        ],
        spacing: { after: 400 }
      }),

      // Q a SET B
      new Paragraph({
        children: [new TextRun({ text: "a) The myelinated fibers are fast conducting as compared to unmyelinated fibers.", bold: true, size: 24, font: "Times New Roman" })],
        spacing: { before: 200, after: 100 }
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      new Paragraph({
        children: [new TextRun({
          text: "Nerve fibers are classified as myelinated (A and B fibers) and unmyelinated (C fibers) based on the presence or absence of a myelin sheath. Myelinated fibers conduct nerve impulses much faster due to the mechanism of saltatory conduction:",
          size: 24, font: "Times New Roman"
        })],
        spacing: { after: 100 }
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      new Paragraph({
        children: [new TextRun({ text: "1. Myelin sheath: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "Myelin is a lipid-rich insulating layer formed by Schwann cells (in the peripheral nervous system) wrapped around the axon. It acts as an electrical insulator, preventing ion flow across the membrane along myelinated segments.", size: 24, font: "Times New Roman" })],
        spacing: { after: 80 }
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      new Paragraph({
        children: [new TextRun({ text: "2. Nodes of Ranvier: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "Gaps in the myelin sheath called nodes of Ranvier are the only sites where ion exchange (depolarization) can occur. The action potential therefore 'jumps' from node to node - this is saltatory conduction (from Latin 'saltare' = to jump).", size: 24, font: "Times New Roman" })],
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      new Paragraph({
        children: [new TextRun({ text: "3. Speed: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "Because the impulse jumps long distances between nodes rather than propagating point-to-point, myelinated fibers conduct at 70-120 m/s (A-alpha fibers), whereas unmyelinated C fibers conduct at only 0.5-2 m/s.", size: 24, font: "Times New Roman" })],
        spacing: { after: 100 }
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      new Paragraph({
        children: [new TextRun({
          text: "Additionally, saltatory conduction is more energy-efficient as Na+/K+ ATPase only needs to restore ionic gradients at the nodes rather than along the entire axon length.",
          size: 24, font: "Times New Roman"
        })],
        spacing: { after: 300 }
      }),

      // Q b SET B
      new Paragraph({
        children: [new TextRun({ text: "b) There is muscle weakness in Myasthenia Gravis.", bold: true, size: 24, font: "Times New Roman" })],
        spacing: { before: 200, after: 100 }
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          text: "Myasthenia Gravis (MG) is an autoimmune disorder in which the body produces IgG autoantibodies directed against nicotinic acetylcholine receptors (nAChRs) at the postsynaptic membrane of the neuromuscular junction (NMJ).",
          size: 24, font: "Times New Roman"
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        spacing: { after: 100 }
      }),
      new Paragraph({
        children: [new TextRun({ text: "Normal NMJ transmission: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "Normally, a motor nerve action potential triggers acetylcholine (ACh) release from the presynaptic terminal. ACh binds to nAChRs on the motor end plate, generating an end plate potential that triggers a muscle action potential and contraction.", size: 24, font: "Times New Roman" })],
        spacing: { after: 80 }
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      new Paragraph({
        children: [new TextRun({ text: "In Myasthenia Gravis: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "The anti-AChR antibodies cause: (1) complement-mediated destruction of the postsynaptic membrane, (2) accelerated internalization and degradation of AChR, and (3) direct blockade of the ACh binding site. The net result is a marked reduction in functional AChRs.", size: 24, font: "Times New Roman" })],
        spacing: { after: 80 }
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      new Paragraph({
        children: [new TextRun({ text: "Consequence: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "With fewer functional receptors, each nerve impulse generates a smaller end plate potential. As a result, muscle fibers fail to reach the threshold for action potential generation, leading to progressive muscle weakness - characteristically worse with repetitive activity and improving with rest.", size: 24, font: "Times New Roman" })],
        spacing: { after: 300 }
      }),

      // Q c SET B
      new Paragraph({
        children: [new TextRun({ text: "c) Steroid therapy is tapered off gradually and not stopped suddenly.", bold: true, size: 24, font: "Times New Roman" })],
        spacing: { before: 200, after: 100 }
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        children: [new TextRun({
          text: "Exogenous corticosteroids (e.g., prednisolone, dexamethasone) are widely used for their anti-inflammatory and immunosuppressive effects. However, they cannot be stopped abruptly due to the phenomenon of HPA axis suppression:",
          size: 24, font: "Times New Roman"
        })],
        spacing: { after: 100 }
      }),
      new Paragraph({
        children: [new TextRun({ text: "Normal HPA axis: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "The hypothalamus releases CRH, which stimulates the pituitary to release ACTH, which in turn stimulates the adrenal cortex to produce cortisol. Cortisol exerts negative feedback on both the hypothalamus and pituitary.", size: 24, font: "Times New Roman" })],
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      new Paragraph({
        children: [new TextRun({ text: "During exogenous steroid therapy: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "The high circulating corticosteroid levels suppress CRH and ACTH secretion via negative feedback. With prolonged use, the adrenal cortex undergoes atrophy due to lack of ACTH stimulation.", size: 24, font: "Times New Roman" })],
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      new Paragraph({
        children: [new TextRun({ text: "If stopped suddenly: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "The atrophied adrenal glands cannot immediately produce adequate endogenous cortisol. This results in acute adrenal insufficiency (adrenal crisis), manifesting as hypotension, hypoglycemia, electrolyte imbalance (hyponatremia, hyperkalemia), weakness, and potentially circulatory collapse and death.", size: 24, font: "Times New Roman" })],
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        children: [new TextRun({ text: "Gradual tapering: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "Slowly reducing the dose over weeks to months allows the HPA axis to gradually recover its function and the adrenal cortex to regain normal responsiveness before the exogenous source is completely withdrawn.", size: 24, font: "Times New Roman" })],
        spacing: { after: 300 }
      }),

      // Q d SET B
      new Paragraph({
        children: [new TextRun({ text: "d) Cryptorchidism is associated with Sterility.", bold: true, size: 24, font: "Times New Roman" })],
        spacing: { before: 200, after: 100 }
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          text: "Cryptorchidism (undescended testis) refers to the failure of one or both testes to descend into the scrotum. It is associated with sterility (infertility) for the following reasons:",
          size: 24, font: "Times New Roman"
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        spacing: { after: 100 }
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      new Paragraph({
        children: [new TextRun({ text: "1. Temperature sensitivity of spermatogenesis: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "Normal spermatogenesis requires a temperature approximately 2-3°C lower than core body temperature (37°C). The scrotum provides this cooler environment (~34-35°C). When the testis remains in the abdomen or inguinal canal, it is exposed to the higher core body temperature, which inhibits spermatogenesis and causes progressive degeneration of the germinal epithelium.", size: 24, font: "Times New Roman" })],
        spacing: { after: 80 }
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      new Paragraph({
        children: [new TextRun({ text: "2. Structural damage: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "Prolonged heat exposure causes irreversible damage to spermatogonia (the stem cells of spermatogenesis) and Sertoli cells, leading to testicular atrophy.", size: 24, font: "Times New Roman" })],
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      new Paragraph({
        children: [new TextRun({ text: "3. Bilateral involvement: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "In bilateral cryptorchidism, both testes are affected, causing complete azoospermia and infertility. Even in unilateral cryptorchidism, the contralateral normally descended testis may also have impaired spermatogenesis.", size: 24, font: "Times New Roman" })],
        spacing: { after: 100 }
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        children: [new TextRun({
          text: "Note: Steroidogenesis (testosterone production by Leydig cells) is less temperature-sensitive and may remain relatively normal, so cryptorchid males often have normal virilization but impaired fertility. Early surgical correction (orchiopexy) before age 2 years can preserve some fertility.",
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        spacing: { after: 300 }
      }),

      // Q e SET B
      new Paragraph({
        children: [new TextRun({ text: "e) There is muscle wasting in lower motor neuron lesion.", bold: true, size: 24, font: "Times New Roman" })],
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          text: "Lower motor neurons (LMNs) are the final common pathway from the spinal cord (anterior horn cells) or brainstem motor nuclei to the skeletal muscle. A lower motor neuron lesion (LMNL) results in a characteristic set of signs, of which muscle wasting (atrophy) is one of the most prominent.",
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        spacing: { after: 100 }
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        children: [new TextRun({ text: "Mechanism of wasting: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "Skeletal muscles require continuous trophic (neurotrophic) support from their innervating motor neurons to maintain their size and structure. Motor neurons release acetylcholine and various neurotrophic factors that are essential for maintaining the metabolic activity of muscle fibers.", size: 24, font: "Times New Roman" })],
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        children: [new TextRun({ text: "When LMN is damaged: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "The muscle is denervated - it loses both its neural input (causing flaccid paralysis) and its neurotrophic support. Without neurotrophic factors, muscle protein synthesis decreases and protein catabolism increases. This leads to progressive muscle fiber atrophy and wasting, termed denervation atrophy.", size: 24, font: "Times New Roman" })],
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      new Paragraph({
        children: [new TextRun({ text: "Features of LMNL: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "Flaccid paralysis, hypotonia (reduced tone), areflexia (absent reflexes), fasciculations (spontaneous muscle twitches due to denervated muscle fibers firing randomly), and significant muscle wasting. This contrasts with upper motor neuron lesions, where wasting is minimal because the LMN and its trophic influence are intact.", size: 24, font: "Times New Roman" })],
        spacing: { after: 300 }
      }),

      // Q f SET B
      new Paragraph({
        children: [new TextRun({ text: "f) Concave lenses are used for correcting the myopic eyes.", bold: true, size: 24, font: "Times New Roman" })],
        spacing: { before: 200, after: 100 }
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          text: "Myopia (short-sightedness / near-sightedness) is a refractive error in which parallel rays of light from a distant object are brought to a focus in front of the retina, rather than on it. This occurs because the eyeball is too long (axial myopia) or the lens/cornea is too curved (refractive myopia), causing excessive convergence of light.",
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        children: [new TextRun({ text: "Why concave (diverging) lens: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "A concave (biconcave) lens is a diverging lens - it causes parallel rays of incoming light to diverge (spread out) before they enter the eye. This effectively moves the focal point backwards (posteriorly), placing it exactly on the retina instead of in front of it.", size: 24, font: "Times New Roman" })],
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      new Paragraph({
        children: [new TextRun({ text: "Effect: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "The diverging effect of the concave lens compensates for the excessive converging power of the myopic eye. The power of the corrective lens (in diopters) is negative (e.g., -2D), and its magnitude equals the far point distance expressed in meters.", size: 24, font: "Times New Roman" })],
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      new Paragraph({
        children: [new TextRun({ text: "Contrast with hypermetropia: ", bold: true, size: 24, font: "Times New Roman" }), new TextRun({ text: "In hypermetropia (long-sightedness), light focuses behind the retina and a convex (converging) lens is used to bring it forward onto the retina.", size: 24, font: "Times New Roman" })],
        spacing: { after: 300 }
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