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The cardiac cycle comprises the flow of blood through the heart during systole and diastole. The heart has 4 chambers (two atria and two ventricles) separated by atrioventricular valves. The function of the heart valves is to direct the flow of blood during the phases of the cardiac cycle. The atrioventricular valves (mitral and tricuspid) prevent the return of blood to the atria during systole and the aortic and pulmonary valves prevent the return of blood to the ventricles during diastole. To understand the physiology of the cardiac cycle and heart valves, don't miss this video from Human Physiology. Be a member of this channel and get benefits: / @fisiologiahumanaa Cardiovascular system: • Cardiovascular physiology Share this video: • Cardiac cycle and heart valves – F... Subscribe to the channel: http://bit.ly/3uR2aFJ Instagram: @fisiologia__humana #HumanPhysiology