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
-
The sensory receptor responsible for the stretch (myotatic) reflex is the:
सही उत्तर: क) Muscle spindle
Muscle spindles detect changes in muscle length and, via Ia afferents, monosynaptically excite alpha motor neurons of the same muscle (e.g. knee jerk). Golgi tendon organs sense tension and mediate the inverse stretch reflex.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Slow, poorly localised, burning pain is carried mainly by:
सही उत्तर: क) C fibres
Unmyelinated C fibres conduct slowly and carry dull, burning, poorly localised pain. Thinly myelinated A-delta fibres carry fast, sharp, well-localised pain.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
During skeletal muscle contraction, which band of the sarcomere remains constant in length?
सही उत्तर: क) A band
The A band corresponds to the full length of the thick (myosin) filaments, which do not shorten. According to the sliding filament theory, the I band and H zone narrow and the Z lines move closer together.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
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)
-
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)
-
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)
-
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)
-
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)
-
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)
-
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)
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।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
AI ले गल्ती गर्न सक्छ। महत्वपूर्ण कुरा आधिकारिक स्रोतमा जाँच्नुहोस्।