One complete heartbeat consists of one systole and one diastole and lasts for about:
Correct answer: A. 0.8 sec
- A. 0.8 sec
- B. 0.2 sec
- C. 0.4 sec
- D. 0.5 sec
Explanation
0.8 seconds: This option is the correct answer. One complete heartbeat, which includes one systole (contraction) and one diastole (relaxation) of the heart, typically lasts for 0.8 seconds.
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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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