Cardiac cycle
- Cardiac cycle refers to the one cycle of contraction and relaxation of the cardiac muscles or one heartbeat.
- A heart beat consists of contraction and relaxation of atria and ventricles.
- The phase of contraction is referred to as systole while the phase of relaxation is called diastole.
- The term joint diastole is used when both atria and ventricles are undergoing relaxation or diastole together
- During joint diastole, the blood is carried from superior and inferior vena cava into the atria and from atria to the ventricles through auriculoventricular valves
- Blood flow is then restricted from ventricle to aorta and pulmonary trunk
As we learnt:
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The total diastolic time of ventricle in cardiac cycle is 0-5 sec. Hence, the correct answer is option b.
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