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NEET MDS Quiz - Practice Test
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Practice Test

Physiology - 3 Questions

1
Physiology

What is the primary effect of acetylcholine on the cardiac muscles?
1) Decreased heart rate
2) Increased heart rate
3) No effect on heart rate
4) Increased force of contraction

📝 Explanation:

Answer: 1) Decreased heart rate
Explanation: In the heart, acetylcholine acts on muscarinic receptors, which are present on the sinoatrial (SA) and atrioventricular (AV) nodes. This leads to a decrease in heart rate by slowing the sinoatrial (SA) node's automaticity and increasing the time it takes for an electrical impulse to pass through the AV node.

2
Physiology

What type of receptors are found in the heart that are stimulated by the parasympathetic nervous system?
1) Adrenergic receptors
2) Muscarinic receptors
3) Nicotinic receptors
4) GABAergic receptors

📝 Explanation:

The parasympathetic nervous system acts on muscarinic receptors (specifically M2 receptors) in the heart to decrease the heart rate and atrial contractility, thereby contributing to a resting state and energy conservation.

3
Physiology
Which of the following is NOT an action of bile salts?
1) Emulsification of fat
2) Facilitation of fat absorption
3) Neutralization of stomach acid
4) Conjugation of bile acids

📝 Explanation:

Bile salts are involved in the emulsification and absorption of fat, not in neutralizing stomach acid.

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