First slide

Regulation of Cardiac Activity

Question

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

Easy

A

Reduce both heart rate and cardiac output.
B

Heart rate is increased without affecting the cardiac output.
C

Both heart rate and cardiac output increase.
D

Heart rate decreases but cardiac output increases.

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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