The walls of atria and walls of ventricles are relaxed during:
Correct answer: B. Diastole
- A. Systole
- B. Diastole
- C. Atrial systole
- D. Ventricular systole
Explanation
Diastole is the phase of relaxation in the cardiac cycle. During diastole, the heart chambers relax and fill with blood.
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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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