Contraction of skeletal muscle is initiated by

B - Acetylcholine released at neuromuscular junction binds to receptors, triggering muscle contraction.

The primary pacemaker of the heart

B - SA node generates impulses that initiate the heartbeat rhythm.

Hemoglobin's oxygen affinity increases in

B - Low temperature stabilizes the oxygen-bound form of hemoglobin.

Gas exchange in the lungs takes place at

C - Alveoli are the thin-walled structures where diffusion of gases occurs.

The resting membrane potential of a typical neuron is about

A - A typical neuron maintains a resting potential of −70 mV due to ion distribution.

Parathyroid hormone increases blood calcium levels by

D - PTH increases calcium levels by promoting bone breakdown and calcium release.

Cardiac output is the product of

A - Cardiac output equals stroke volume times heart rate.

The primary function of the loop of Henle

A - The descending limb of the loop reabsorbs water, concentrating the filtrate.

An action potential is propagated due to

D - Voltage-gated ion channels open and close to propagate the electrical impulse.

The main site of nutrient absorption in the GI tract

C - The small intestine, particularly jejunum and ileum, is the major site for nutrient absorption.

Physiology MCQs

Physiology MCQs help medical and dental students master body functions across cardiovascular, respiratory, renal, digestive, endocrine, and neurophysiology systems. Ideal for MDCAT, NTS, USMLE, and FCPS, these quizzes boost retention and exam success.

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