चिकित्सा स्नातकोत्तर प्रवेश (MECEE-PG) MD / MS / MDS प्रवेश परीक्षा तयारी
चिकित्सा स्नातकोत्तर प्रवेश (MECEE-PG) – MD / MS / MDS प्रवेश परीक्षा
MECEE-PG – MD/MS/MDS · MECEE-PG (MD/MS/MDS)
२,८६५ प्रश्न उपलब्ध। मोड छान्नुहोस्:
MD/MS/MDS प्रवेश: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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In skeletal muscle, calcium released from the sarcoplasmic reticulum initiates contraction by binding to:
सही उत्तर: ख) Troponin C
Ca2+ binding to troponin C shifts tropomyosin, exposing myosin-binding sites on actin. In smooth muscle, Ca2+ binds calmodulin, which activates myosin light chain kinase.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The hormone that stimulates a bicarbonate-rich pancreatic secretion is:
सही उत्तर: क) Secretin
Secretin, released from duodenal S cells in response to acid, stimulates ductal cells to secrete bicarbonate. Cholecystokinin mainly stimulates enzyme secretion and gallbladder contraction.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Intrinsic factor, required for vitamin B12 absorption, is secreted by the:
सही उत्तर: घ) Parietal cells of the stomach
Parietal (oxyntic) cells secrete both HCl and intrinsic factor, so their autoimmune destruction causes pernicious anaemia. Chief cells secrete pepsinogen; the B12–IF complex is absorbed in the terminal ileum.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Aldosterone is secreted by which zone of the adrenal cortex?
सही उत्तर: ग) Zona glomerulosa
The zona glomerulosa (outermost layer) secretes aldosterone, regulated mainly by angiotensin II and plasma K+. The zona fasciculata secretes cortisol and the reticularis secretes adrenal androgens (memory: 'salt, sugar, sex').
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Calcitonin is secreted by the:
सही उत्तर: ख) Parafollicular (C) cells of the thyroid
Calcitonin from thyroid C cells lowers plasma calcium mainly by inhibiting osteoclasts. It is a tumour marker for medullary thyroid carcinoma, whereas PTH from parathyroid chief cells raises calcium.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The milk ejection (let-down) reflex is mediated by:
सही उत्तर: ख) Oxytocin
Suckling triggers oxytocin release from the posterior pituitary, contracting myoepithelial cells around the alveoli to eject milk. Prolactin from the anterior pituitary stimulates milk production, not ejection.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The approximate renal threshold for glucose in a healthy adult is:
सही उत्तर: घ) 180 mg/dL
Glucose appears in urine when plasma glucose exceeds about 180 mg/dL, as the SGLT2/SGLT1 transporters begin to saturate. The higher tubular transport maximum (about 375 mg/min) is reached only when all nephrons are saturated.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Renin is secreted by the:
सही उत्तर: ग) Juxtaglomerular cells of the afferent arteriole
Juxtaglomerular (granular) cells are modified smooth muscle cells of the afferent arteriole that secrete renin. The macula densa senses tubular NaCl and signals the JG cells, but does not secrete renin itself.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Antidiuretic hormone (ADH) increases water reabsorption in the collecting duct by acting on:
सही उत्तर: ग) V2 receptors, inserting aquaporin-2 channels
ADH binds V2 receptors on principal cells, raising cAMP and inserting aquaporin-2 into the luminal membrane. V1 receptors mediate vasoconstriction, and aldosterone acts via mineralocorticoid receptors on ENaC.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Central chemoreceptors in the medulla are stimulated mainly by:
सही उत्तर: ग) A rise in H+ concentration of the surrounding CSF/interstitial fluid
CO2 diffuses across the blood–brain barrier and forms H+ in CSF, which stimulates central chemoreceptors; this drives most of normal ventilation. Hypoxia is sensed by peripheral chemoreceptors in the carotid and aortic bodies.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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