During which of the following periods are the large elastic arteries distributing blood to smaller arteries downstream, and aortic BP is slowly falling? a. Ventricular systole b. Atrial systole c. Ventricular diastole d. Atrial diastole
The cardiac cycle is referred to as one heartbeat that consists of one cycle of contraction and relaxation of the cardiac muscles. The atria and ventricles contract and relax to circulate the blood in the circulatory system. The period of one cardiac cycle is 0.8 seconds.
Ventricular systole: - during ventricular systole, the walls of the ventricles contract and the bicuspid and tricuspid valves close which is also responsible for the first heart sound. The complete contraction results in the blood flow from the ventricle to the pulmonary trunk and aorta due to the opening of the semilunar valves.
Atrial systole: - during atrial systole, atria contracts and the blood is forced into the ventricles due to the opening of the bicuspid and tricuspid valves.
Ventricular diastole: - ventricle relaxes and the semilunar valves get closed to avoid the flow of the blood from the aorta back into the ventricles.
Atrial diastole: - in this, the walls of the atria relax and receives the blood.
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