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Q.

How do parasympathetic neural signals affect the working of the heart?

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a

Both heart rate and cardiac output increase.

b

Heart rate is increased without affecting the cardiac output.

c

Heart rate decreases but cardiac output increases.

d

Reduce both heart rate and cardiac output.

answer is A.

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Detailed Solution

Neural signals through the sympathetic nerves (part of ANS) can increase the rate of heart beat, the strength of ventricular contraction and thereby the cardiac output. On the other hand, parasympathetic neural signals (another component of ANS) decrease the rate of heart beat, speed of conduction of action potential and thereby the cardiac output.

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