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Question

If the sympathetic nerve to the heart is cut-off, the heart beat will


A
Increase
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B
Decrease
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C
Remain the same
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D
Stop
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Solution

The correct option is C Remain the same
The muscle of the heart is called as cardiac muscle. The tissue is said to be myogenic, i.e., it does not need electrical impulses from a nerve to make it contract. If the cardiac muscle is supplied with oxygen and nutrients (a task carried out by the coronary arteries) it will continue to contract at a steady pace. Nerves supplying the heart, though they are not needed to start the contractions, can bring about an increase or decrease in the rate of contractions when necessary. Therefore, the correct answer is option C.

Biology

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