Cardiac Cycle is the sequence of rрythmic repetitive mechanical, electrical and haemodynamic events, which occur during heart work. Cardiac Cycle is divided into two fases: systole (contraction) and diastole (relaxation). There are systole of ventricles and atria, diastole of ventricles and atria, and common diastole. Systol of ventricle developes through period of strength (increases of pressure inside of ventricles enough for closure of mitral and tricuspid valves, increases of pressure inside of ventricles enough for opening of semilunar valves) and period of ejection. Diastol of ventricle developes through period of relaxation (decreases of pressure inside of ventricles enough for closure of semilunar valves, decreases of pressure inside of ventricles enough for opening of mitral and tricuspid valves) and period of filling. Final stage of filling is active due to systole of atria, after what next Cardiac Cycle starts.
The cardiac cycle is the sequence of events that occurs when the heart beats. As the heart beats, it circulates blood through pulmonary and systemic circuits of the body. There are two phases of the cardiac cycle. In the diastole phase, the heart ventricles are relaxed and the heart fills with blood.Oct 13, 2017