how does the cardiac cycle work
The cardiac cycle consists of a systole and a diastole. The cardiac cycle begins with a joint diastole (relaxation of all four chambers of the heart). This is followed by an arterial systole (contraction of left and right atria) stimulated by the generation of an action potential by the Sino-Auricular Node (SA node).his is followed by closing of the AV valves which produces the sound 'lubb' and the closure of the Semilunar valves causes produces the sound 'dub'. How your heart works-Know your cardiac cycle and blood flow in heart.