5 REGULATION OF CARDIAC ACTIVITYS:

1.	5 REGULATION OF CARDIAC ACTIVITYS:
Answer» Cardiac cycle helps in the circulation of blood. It includes systole (contraction of cardiac muscles) and diastole (relaxation of cardiac muscles). The cardiac cycle is a normal activity of thehuman heartand is regulated automatically by the nodal tissues- sinoatrial node (SA node) and atrioventricular node(AV node). The variation in the cardiac cycle results in increase or decrease of the cardiac output. The occurrence of a cardiac cycle is illustrated by a heartbeat rate which is beats per minute. Our heart beats 72 times per minute and is stated as 72 cardiac cycles per minute.

Answer»

Cardiac cycle helps in the circulation of blood. It includes systole (contraction of cardiac muscles) and diastole (relaxation of cardiac muscles). The cardiac cycle is a normal activity of thehuman heartand is regulated automatically by the nodal tissues- sinoatrial node (SA node) and atrioventricular node(AV node). The variation in the cardiac cycle results in increase or decrease of the cardiac output.

The occurrence of a cardiac cycle is illustrated by a heartbeat rate which is beats per minute. Our heart beats 72 times per minute and is stated as 72 cardiac cycles per minute.

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