Question

cardiac muscles are known as natural pacemakers of the heart.give reason​

Answer 1

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The cells of the SA node at the top of the heart are known as the pacemaker of the heart because the rate at which these cells send out electrical signals determines the rate at which the entire heart beats (heart rate). The normal heart rate at rest ranges between 60 and 100 beats per minute.

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Answer 2

The cells of the SA node at the top of the heart are known as the pacemaker of the heart because the rate at which these cells send out electrical signals determines the rate at which the entire heart beats (heart rate). The normal heart rate at rest ranges between 60 and 100 beats per minute.