Designed by
Title
Heart - Conduction System #56002086
Description
1. The cardiac cycle begins at the SA (sinoatrial) node located in the sulcus terminalis between the superior vena cava and the right atrium. 2. From this pacemaker, a wave of negativity (excitation) spreads over both atria and initiates atrial contraction, thereby increasing atrial blood pressure. 3. When atrial pressure exceeds ventricular pressure, both atrioventricular (AV) valves open and bl