ANATOMY

Detailed explanation-1: -The total period of the cardiac cycle is 0.8 seconds which includes a cardiac diastole of 0.4 seconds, a ventricular systole of 0.3 seconds and an atrial systole of 0.1 seconds.

Detailed explanation-2: -A healthy human heart beats 72 times per minute which states that there are 72 cardiac cycles per minute. The cardiac cycle involves a complete contraction and relaxation of both the atria and ventricles and the cycle last approximately 0.8 seconds.

Detailed explanation-3: -The normal duration of the cardiac cycle is 0.8 second. Atrial systole-0.1 sec. Atrial diastole-0.7 sec.

Detailed explanation-4: -Cardiac Cycle Each of these cycles starts with the depolarization of the SA node which is then followed by the atrial systole [0.1 seconds], then ventricular systole [0.3 seconds], followed by the diastole of the complete heart [0.4 seconds].

Detailed explanation-5: -There is an inverse relationship between the duration of cardiac cycle and heart rate. Hence when the heart rate is increased to 120 beats per minute, the cardiac cycle duration will be about 0.5 sec.