GENERAL ANATOMY
CARDIOVASCULAR SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the contraction of the atria
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the sequence of events that occur during one complete heartbeat
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the contraction and relaxation of the ventricles
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the circulation of blood in the heart, lungs and body
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Detailed explanation-1: -The cardiac cycle is the performance of the human heart from the beginning of one heartbeat to the beginning of the next. It consists of two periods: one during which the heart muscle relaxes and refills with blood, called diastole, following a period of robust contraction and pumping of blood, called systole.
Detailed explanation-2: -Atrial systole, atrial diastole, ventricular systole, ventricular diastole.
Detailed explanation-3: -The cardiac cycle starts with atrial systole. It represents the contraction of the myocardium of the left and right atria by which blood is forced into the ventricles. It progresses to ventricular systole, in which the ventricles contract and blood forced into the aorta and pulmonary artery.