आधारभूत विज्ञान (Anatomy, Physiology, Biochemistry) – Basic Sciences MCQ
आधारभूत विज्ञान (Anatomy, Physiology, Biochemistry) – MD/MS प्रवेश
Basic Sciences · MECEE-PG – MD/MS/MDS Entrance · ४३३ प्रश्न
४३३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
आधारभूत विज्ञान (Anatomy, Physiology, Biochemistry): 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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The 'funny current' (If) responsible for pacemaker depolarisation in the SA node is carried mainly by:
सही उत्तर: ग) Na⁺ entering through HCN channels opened by hyperpolarisation
If is an inward Na⁺-dominant current through hyperpolarisation-activated cyclic nucleotide-gated (HCN) channels; ivabradine blocks it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The plateau (phase 2) of the ventricular muscle action potential is mainly due to:
सही उत्तर: ख) Slow inward Ca²⁺ current through L-type channels
During phase 2, Ca²⁺ influx through L-type channels balances K⁺ efflux, producing the plateau and a long refractory period.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A patient consumes 250 mL of oxygen per minute; arterial O₂ content is 200 mL/L and mixed venous O₂ content is 150 mL/L. By the Fick principle, the cardiac output is:
सही उत्तर: ग) 5 L/min
Cardiac output = O₂ consumption ÷ (arterial − venous O₂ content) = 250 ÷ (200 − 150) = 5 L/min.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Melanocytes of the skin and the adrenal medulla share a common embryological origin from the:
सही उत्तर: घ) Neural crest
Neural crest cells give rise to melanocytes, adrenal medullary chromaffin cells, dorsal root ganglia and Schwann cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Microglia of the central nervous system are derived from:
सही उत्तर: क) Mesoderm (yolk-sac macrophage lineage)
Microglia are resident CNS macrophages of mesodermal (myeloid) origin, unlike astrocytes and oligodendrocytes, which are neuroectodermal.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Brunner's glands are characteristically found in the submucosa of the:
सही उत्तर: ग) Duodenum
Brunner's glands are submucosal glands unique to the duodenum; they secrete alkaline mucus that neutralises gastric acid.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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After birth, the left umbilical vein becomes the:
सही उत्तर: घ) Ligamentum teres hepatis
The obliterated umbilical vein forms the ligamentum teres in the free edge of the falciform ligament; the ductus venosus becomes the ligamentum venosum.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The adult remnant of the notochord is the:
सही उत्तर: क) Nucleus pulposus
The notochord persists in the adult as the nucleus pulposus of the intervertebral discs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The muscles of facial expression develop from the:
सही उत्तर: ख) Second pharyngeal arch
Second (hyoid) arch derivatives are supplied by the facial nerve and include the muscles of facial expression, stapes and styloid process.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Spontaneous intracerebral haemorrhage in hypertension most often arises from rupture of the:
सही उत्तर: घ) Lenticulostriate branches of the middle cerebral artery
The lenticulostriate arteries ('arteries of cerebral haemorrhage') are thin end-arteries arising at right angles from the MCA and develop Charcot–Bouchard microaneurysms.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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