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.
Q: The oxygen-carrying protein in red blood cells
A) Hemoglobin
B) Myosin
C) Albumin
D) Fibrinogen
✅ Correct Answer: A
Explanation: Hemoglobin binds oxygen in the lungs and releases it in tissues.
Q: The function of surfactant in the lungs
A) Stimulate ciliary motion
B) Reduce surface tension
C) Promote mucus secretion
D) Increase airway resistance
✅ Correct Answer: B
Explanation: Surfactant prevents alveolar collapse by lowering surface tension.
Q: Blood pressure is primarily regulated by
A) Spleen
B) Pulmonary arteries
C) Autonomic nervous system
D) Thymus
✅ Correct Answer: C
Explanation: The autonomic system adjusts heart rate and vessel tone to maintain blood pressure.
Q: Vitamin K is essential for
A) Nerve conduction
B) Red blood cell synthesis
C) Coagulation
D) Bone resorption
✅ Correct Answer: C
Explanation: Vitamin K is required for synthesis of clotting factors in the liver.
Q: Increased secretion of ADH leads to
A) Water retention
B) Diuresis
C) Decreased blood volume
D) Sodium excretion
✅ Correct Answer: A
Explanation: ADH promotes water reabsorption in kidneys, reducing urine output.