  
{"id":18842,"date":"2026-05-04T06:19:40","date_gmt":"2026-05-04T06:19:40","guid":{"rendered":"https:\/\/www.diginerve.com\/blogs\/?p=18842"},"modified":"2026-05-12T07:18:53","modified_gmt":"2026-05-12T07:18:53","slug":"important-physiology-questions-for-neet-pg","status":"publish","type":"post","link":"https:\/\/www.diginerve.com\/blogs\/important-physiology-questions-for-neet-pg\/","title":{"rendered":"Important Physiology Questions for NEET PG 2026"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Physiology is one of the most important subjects for NEET PG because it forms the conceptual base for Medicine, Pathology, Pharmacology, and many clinical subjects. In NEET PG, physiology questions are usually concept-based rather than memorisation-based, and they often test mechanisms, applied clinical scenarios, graphs, ECGs, spirometry, neuromuscular physiology, renal function, endocrinology, and cardiovascular regulation. The following 20 important questions are prepared in a NEET PG-oriented format to help students quickly revise high-yield topics and understand the core concepts required to solve clinical and integrated MCQs.<\/span><\/p>\n<h2><strong>Here are the Physiology Questions for NEET PG 2026<\/strong><\/h2>\n<p><b>Q1. The most important determinant of resting membrane potential in neurons is:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. Sodium permeability<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Potassium permeability<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. Calcium permeability<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Chloride permeability<\/span><\/p>\n<p><b>Answer: B. Potassium permeability<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">At rest, the cell membrane is most permeable to K<\/span><span style=\"font-weight: 400;\">\u207a<\/span><span style=\"font-weight: 400;\">, so the resting membrane potential lies close to the K<\/span><span style=\"font-weight: 400;\">\u207a<\/span><span style=\"font-weight: 400;\"> equilibrium potential.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q2. The upstroke of the action potential in a neuron is due to:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. K<\/span><span style=\"font-weight: 400;\">\u207a<\/span><span style=\"font-weight: 400;\"> efflux<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Na<\/span><span style=\"font-weight: 400;\">\u207a<\/span><span style=\"font-weight: 400;\"> influx<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. Ca\u00b2<\/span><span style=\"font-weight: 400;\">\u207a<\/span><span style=\"font-weight: 400;\"> efflux<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Cl<\/span><span style=\"font-weight: 400;\">\u207b<\/span><span style=\"font-weight: 400;\"> influx<\/span><\/p>\n<p><b>Answer: B. Na<\/b><b>\u207a<\/b><b> influx<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">The opening of voltage-gated sodium channels causes rapid depolarisation.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q3. A patient has myasthenia gravis. The defect is at:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. Presynaptic Ca\u00b2<\/span><span style=\"font-weight: 400;\">\u207a<\/span><span style=\"font-weight: 400;\"> channel<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Acetylcholine receptor at the neuromuscular junction<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. Acetylcholinesterase enzyme excess<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Muscle ryanodine receptor<\/span><\/p>\n<p><b>Answer: B. Acetylcholine receptor at the neuromuscular junction<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Myasthenia gravis is due to antibodies against postsynaptic nicotinic acetylcholine receptors.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q4. The PR interval in ECG represents:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. Ventricular depolarisation<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Atrial repolarisation<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. AV nodal conduction time<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Ventricular repolarisation<\/span><\/p>\n<p><b>Answer: C. AV nodal conduction time<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">PR interval reflects conduction from the atria through the AV node to the ventricles.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q5. The second heart sound is produced mainly by:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. Closure of AV valves<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Opening of semilunar valves<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. Closure of semilunar valves<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Rapid ventricular filling<\/span><\/p>\n<p><b>Answer: C. Closure of semilunar valves<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">S2 is due to the closure of the aortic and pulmonary valves.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q6. Increased preload causes increased stroke volume due to:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. Bainbridge reflex<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Frank-Starling mechanism<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. Baroreceptor reflex<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Cushing reflex<\/span><\/p>\n<p><b>Answer: B. Frank-Starling mechanism<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Increased venous return stretches cardiac muscle fibres and increases the force of contraction.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q7. In aortic stenosis, the pulse is classically:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. Pulsus paradoxus<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Pulsus bisferiens<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. Pulsus parvus et tardus<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Water-hammer pulse<\/span><\/p>\n<p><b>Answer: C. Pulsus parvus et tardus<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Aortic stenosis produces a slow-rising, low-volume pulse.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q8. The best substance for measuring GFR is:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. PAH<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Inulin<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. Urea<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Creatinine<\/span><\/p>\n<p><b>Answer: B. Inulin<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Inulin is freely filtered, not secreted, not reabsorbed, and not metabolised.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q9. PAH clearance is used to estimate:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. GFR<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Renal plasma flow<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. Renal blood flow directly<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Tubular reabsorption rate<\/span><\/p>\n<p><b>Answer: B. Renal plasma flow<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">PAH is filtered and secreted, so its clearance approximates effective renal plasma flow.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q10. Counter-current multiplication in the kidney mainly occurs in:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. Proximal convoluted tubule<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Loop of Henle<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. Distal convoluted tubule<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Collecting duct only<\/span><\/p>\n<p><b>Answer: B. Loop of Henle<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">The thick ascending limb actively reabsorbs NaCl and is impermeable to water, creating the medullary gradient.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q11. ADH increases water reabsorption by inserting:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. Aquaporin-1 in PCT<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Aquaporin-2 in the collecting duct<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. ENaC in the loop of Henle<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Na<\/span><span style=\"font-weight: 400;\">\u207a<\/span><span style=\"font-weight: 400;\">\/K<\/span><span style=\"font-weight: 400;\">\u207a<\/span><span style=\"font-weight: 400;\"> ATPase in the glomerulus<\/span><\/p>\n<p><b>Answer: B. Aquaporin-2 in collecting duct<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">ADH acts on V2 receptors and inserts aquaporin-2 channels in the collecting duct.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q12. In obstructive lung disease, spirometry shows:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. Normal FEV1\/FVC<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Increased FEV1\/FVC<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. Decreased FEV1\/FVC<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Increased vital capacity<\/span><\/p>\n<p><b>Answer: C. Decreased FEV1\/FVC<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">FEV1 falls more than FVC in obstructive diseases like asthma and COPD.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q13. Surfactant is secreted by:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. Type I pneumocytes<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Type II pneumocytes<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. Alveolar macrophages<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Club cells<\/span><\/p>\n<p><b>Answer: B. Type II pneumocytes<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Surfactant reduces alveolar surface tension and prevents collapse.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q14. Pulmonary embolism causes:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. Physiological shunt<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Increased dead space ventilation<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. Reduced anatomical dead space<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Decreased V\/Q ratio<\/span><\/p>\n<p><b>Answer: B. Increased dead space ventilation<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Ventilation is present, but perfusion is reduced, so the V\/Q ratio increases.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q15. A right shift of the oxygen dissociation curve is caused by:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. Decreased temperature<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Decreased PCO\u2082<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. Increased pH<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Increased 2,3-BPG<\/span><\/p>\n<p><b>Answer: D. Increased 2,3-BPG<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Right shift means decreased Hb affinity for oxygen and increased tissue oxygen unloading.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q16. Bitemporal hemianopia is caused by a lesion of:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. Optic nerve<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Optic chiasma<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. Optic tract<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Visual cortex<\/span><\/p>\n<p><b>Answer: B. Optic chiasma<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Compression of crossing nasal retinal fibres causes loss of temporal visual fields.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q17. Pain and temperature fibres decussate in:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. Dorsal column<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Medulla<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. Anterior white commissure of the spinal cord<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Internal capsule<\/span><\/p>\n<p><b>Answer: C. Anterior white commissure of the spinal cord<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Spinothalamic tract fibres cross within 1\u20132 spinal segments after entry.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q18. QAldosterone secretion is mainly stimulated by:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. ACTH only<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Angiotensin II and hyperkalemia<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. TSH<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. ANP<\/span><\/p>\n<p><b>Answer: B. Angiotensin II and hyperkalemia<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Zona glomerulosa secretes aldosterone in response to angiotensin II and increased serum K<\/span><span style=\"font-weight: 400;\">\u207a<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q19. Secretin mainly stimulates:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. Gastric acid secretion<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. Pancreatic bicarbonate secretion<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. Gallbladder contraction<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Pepsinogen secretion<\/span><\/p>\n<p><b>Answer: B. Pancreatic bicarbonate secretion<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Secretin is released from duodenal S cells in response to acid and promotes bicarbonate-rich pancreatic secretion.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Q20. Ovulation is triggered by:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A. FSH surge<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. LH surge<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. Progesterone withdrawal<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. Prolactin surge<\/span><\/p>\n<p><b>Answer: B. LH surge<\/b><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Mid-cycle LH surge causes ovulation and luteinization of the ruptured follicle.<\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Physiology is one of the most important subjects for NEET [&hellip;]<\/p>\n","protected":false},"author":16,"featured_media":18844,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[439],"tags":[974,972,973],"class_list":["post-18842","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-neet-pg-medical-exams-preparation","tag-high-yield-physiology-questions","tag-important-physiology-questions-for-neet-pg-2026","tag-physiology-mcqs-for-neet-pg"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Important Physiology Questions for NEET PG 2026 - 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