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 organ with the largest blood flow per gram of tissue
A) Heart
B) Brain
C) Kidney
D) Liver
✅ Correct Answer: C
Explanation: Kidneys receive a high proportion of cardiac output relative to their size.
Q: Cortisol release follows
A) Sleep-wake rhythm
B) Insulin release
C) Light exposure
D) Fasting state
✅ Correct Answer: A
Explanation: Cortisol secretion peaks in the early morning and follows a circadian pattern.
Q: The neurotransmitter at the neuromuscular junction
A) Dopamine
B) Norepinephrine
C) Serotonin
D) Acetylcholine
✅ Correct Answer: D
Explanation: Acetylcholine binds to nicotinic receptors on skeletal muscle, causing contraction.
Q: The reflex arc component that carries impulses to the CNS
A) Motor neuron
B) Effector
C) Receptor
D) Sensory neuron
✅ Correct Answer: D
Explanation: Sensory neurons transmit stimuli from receptors to the spinal cord or brain.
Q: The spinal tract responsible for pain and temperature
A) Spinothalamic
B) Reticulospinal
C) Vestibulospinal
D) Corticospinal
✅ Correct Answer: A
Explanation: The spinothalamic tract carries sensory input for pain and thermal sensations.