The number of stages involved in a heart beat is:
Correct answer: B. 3
- A. 2
- B. 3
- C. 4
- D. 5
Explanation
Every single heartbeat includes three major stages: atrial systole, ventricular systole, and complete cardiac diastole. Atrial systole is the contraction of the atria that pushes the blood into the ventricles. Ventricular systole is the contraction of the ventricles. The ventricles contract, pumping blood into the pulmonary artery and aorta. Then both atria and ventricles relax. The heart(atria) fills with blood again and prepares for the next beat. This relaxed period is diastole.
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About Circulation
The circulatory system covers the chambers, valves and conducting pathway of the human heart, along with the cardiac cycle and control of heartbeat. It compares arteries, veins and capillaries by structure and function, and explains how the lymphatic system returns tissue fluid, transports absorbed fats and supports immunity.
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