1. The rhythmic contraction and relaxation of the heart is called heartbeat. 2. Each heartbeat includes one systole and one diastole. During systole the heart contracts and during diastole it relaxes. 3. The rate with which the heart beats is called heart rate. The normal heart rate is 72 beats per minute. 4. Tachycardia means faster heart rate of about more than 100 beats per minute. 5. Bradycardia means slower heart rate that is below 60 beats per minute.

Heartbeat.

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Heartbeat.

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The rhythmic contraction and relaxation of the heart is called heartbeat.
Each heartbeat includes one systole and one diastole. During systole the heart contracts and during diastole it relaxes.
The rate with which the heart beats is called heart rate. The normal heart rate is 72 beats per minute.
Tachycardia means faster heart rate of about more than 100 beats per minute.
Bradycardia means slower heart rate that is below 60 beats per minute.

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