One complete heartbeat consists of:
Correct answer: C. One systole and one diastole
- A. One systole
- B. One diastole
- C. One systole and one diastole
- D. One systole and two diastoles
Explanation
Two upper chamber (atria) contract in a single step and both lower chambers (ventricles) relax at that time, then both lower chambers contract simultaneously and upper chamber relax at that time. This creates systole and diastole of both atria and ventricles. Hence, creating one complete heartbeat.
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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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