How the heartbeat is regulated in humans ?

1.	How the heartbeat is regulated in humans ?
Answer» Heart rate\xa0is controlled by the two branches of the autonomic (involuntary) nervous system. The sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS). The sympathetic nervous system (SNS) releases the hormones (catecholamines - epinephrine and norepinephrine) to accelerate the\xa0heart rate. The\xa0heartbeat\xa0is triggered by electrical impulses that travel down a special pathway through your heart: SA node (sinoatrial node) – known as the heart\'s natural pacemaker. The impulse starts in a small bundle of specialized cells located in the right atrium, called the SA node.

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