Cardiac cycle dude(=

The cardiac cycle is a term referring to all or any of the events related to the flow or blood pressure that occurs from the beginning of one heartbeat to the beginning of the next.^[1] The frequency of the cardiac cycle is described by the heart rate.

Diastole

is the period of time when the heart relaxes after contraction in preparation for refilling with circulating blood.

Systole

period of contraction of the ventricles of the heart that occurs between the first and second heart sounds.

Lasting usually 0.3 to 0.4 second