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CGP EDU Academic Team
Published on: August 13, 2026
Neural signals through the sympathetic nerves (ANS) can increase the rate of heartbeat by
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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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