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Cardiac cycle

It is the repetitive pattern of contraction and relaxation of the heart

The contraction phase is called systole

The relaxation phase is called diastole

In this the blood is pumped to the vessels

In this it allows blood to enter the heart

For a normal adult the average systolic pressure is 120 millimeters of mercury (mmHg)

The recommended diastolic pressure for a normal adult is 80 mmHg.

For a child it is 100 mmHg (6 to 9 years).

For children it is 65 mmHg.

Diastolic pressure occurs at the beginning of the cardiac cycle.

It is the minimum pressure in the arteries, when the pumping chambers of the heart fill with blood.

At the end of the cardiac cycle, systolic pressure occurs when the ventricles contract.