Briefly explain the cardiac cycle.

The cardiac cycle is the sequence of events that occurs during one complete heartbeat, involving the contraction and relaxation of the heart's chambers to pump blood throughout the body. It consists of two main phases: the systole and diastole.

1. Systole: Systole is the contraction phase of the cardiac cycle. During this phase, the heart contracts, pushing blood out of the chambers and into the arteries.

a. Atrial Systole: The cardiac cycle begins with atrial systole. The atria contract, forcing blood into the ventricles through the open atrioventricular (AV) valves (tricuspid valve on the right side and ________ __________ _________ _________ _______.
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