Cardiovascular System. Heart Actions A.The cardiac cycle consists of the atria beating in unison (atrial systole) followed by the contraction of both.
Cardiac Cycle and Heart Sounds
Circulatory System and The Heart
a.Sinoatrial node (SA node) b.Atrioventricular node (AV node) c.Atrioventricular bundle (AV bundle) d.Right and left atrioventricular bundle.
