Biology Body Fluids and Circulation Double Circulation and Regulation of Cardiac Activity, Cardiac Cycle,Heart Sound Single Correct MCQ
Published on: August 13, 2026

Neural signals through the sympathetic nerves (ANS) can increase the rate of heartbeat by

A
increasing heart output and
B
increasing the strength of ventricular contraction
C
Both
D
increasing the contraction of atrium

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The correct answer is:
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Under stress condition, the sympathetic nervous system directs adrenal glands to release norepinephrine hormone, also known as Emergency hormones or hormones of Fight or Flight.

Norepinephrine has the following effects on cardiac cells:

Increase in rate of heart beat

Increase in strength of ventricular contraction

Increase in cardiac output.

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