Sarcolemma( ATP)NCX ATP Ca 2Na C Myofilaments NCX ICal, 3Na(Em 三 Contraction Zma、、PCP
Cardiac cycle(心动周期) The cardiac events that occur from beginning of one heartbeat to the beginning of the next are called the cardiac cycle
Cardiac cycle（心动周期） • The cardiac events that occur from beginning of one heartbeat to the beginning of the next are called the cardiac cycle
What happens in the heart during each cardiac cycle? Pressure Volume Valves Blood flow
• Pressure • Volume • Valves • Blood flow What happens in the heart during each cardiac cycle?
(a) systole Isovolumetric ventricular contraction Ventricular ejectio Systole: ventricles contracting Aortic and (b) Diastole Copyrighte~@ Companies, Ine.Permission required tor reproduction or dsplay. lumntric ventricutar retaration Bood flows into ventricles Atrial contraction reared rElaxed Diastole: ventricles relaxed Open alves Cansed closed
Systole: ventricles contracting Diastole: ventricles relaxed
Mechanical Events of the cardiac Cycle Click here to play the Mechanical Events of the Cardiac Cycle Flash Animation
Click here to play the Mechanical Events of the Cardiac Cycle Flash Animation Mechanical Events of the Cardiac Cycle