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: Cerebrospinal fluid is produced mainly by the
A) Pituitary gland
B) Dura mater
C) Arachnoid villi
D) Choroid plexus
✅ Correct Answer: D
Explanation: The choroid plexus in the ventricles secretes CSF.
Q: The phase of the menstrual cycle when ovulation occurs
A) Ovulatory
B) Follicular
C) Luteal
D) Menstrual
✅ Correct Answer: A
Explanation: Ovulation typically occurs mid-cycle and is triggered by a surge in LH.
Q: Pulmonary surfactant increases
A) Lung compliance
B) Pulmonary vascular resistance
C) Surface tension
D) Airway obstruction
✅ Correct Answer: A
Explanation: Surfactant reduces surface tension, making alveoli easier to expand.
Q: Renin is secreted in response to
A) High GFR
B) Low sodium
C) Hyperkalemia
D) Increased blood pressure
✅ Correct Answer: B
Explanation: Low sodium or decreased perfusion stimulates renin release to restore balance.
Q: The part of the nephron where most reabsorption occurs
A) Collecting duct
B) Distal convoluted tubule
C) Proximal convoluted tubule
D) Loop of Henle
✅ Correct Answer: C
Explanation: The proximal tubule reabsorbs the majority of filtered substances.