Diastole is the process that ensures mitral and tricuspid valve closure after the ventricles are filled with blood.
Cardiac cycle events can be divided into diastole and systole. Diastole represents ventricular filling, and systole represents ventricular contraction/ejection. Systole and diastole occur in both the right and left heart, though with very different pressures.
Diastole begins with the closing of the aortic valve (or pulmonic) and ends with the closing of the mitral valve (or tricuspid). This period encompasses the ventricular relaxation and filling.
Diastole represents when the blood vessels return blood to the heart in preparation for the next ventricular contraction.
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