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Physiology NEET MDS Practice Test
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Physiology - 3 Questions

1
Physiology

What is the role of the vagus nerve in regulating heart rate?
1) Increases heart rate
2) Decreases heart rate
3) Has no effect on heart rate
4) Increases the force of heart contractions
E. Increases the conduction velocity of the cardiac impulse

📝 Explanation:

The vagus nerve, a part of the parasympathetic nervous system, has a negative chronotropic effect on the heart, meaning it decreases the heart rate. It does this by releasing acetylcholine onto the sinoatrial (S1) node, which slows the SA node's pacemaker activity.

2
Physiology

What is the primary mechanism by which insulin stimulates glucose uptake in the liver?
1) Induction of glucokinase
2) Increase in glycolysis rate
3) Inhibition of gluconeogenesis
4) Stimulation of glycogenolysis

📝 Explanation:

Answer: 1) Induction of glucokinase
Explanation: Insulin enhances glucose uptake in the liver by inducing the synthesis of glucokinase, an enzyme that converts glucose into glucose-6-phosphate. This "glucose trapping" mechanism keeps intracellular glucose levels low and promotes further glucose entry into the cell.

3
Physiology
What is the primary function of the epididymis in the male reproductive system?
1) Storage and maturation of sperm
2) Secretion of androgens
3) Formation of the spermatozoa
4) Fusion of gametes during fertilization

📝 Explanation:

The epididymis is a coiled tubular structure located behind the testis. Its primary function is to store and mature sperm cells, making them fully motile and capable of fertilization.

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