During the isovolumetric contraction phase of the cardiac cycle, which finding is expected?
Correct answer: A. All four valves are closed
- A. All four valves are closed
- B. The ventricles rapidly fill with blood
- C. The semilunar valves are fully open
- D. The atria actively eject blood into arteries
Explanation
During isovolumetric contraction, ventricular pressure rises while all valves remain closed, so ventricular volume does not change. The semilunar valves open only after ventricular pressure exceeds arterial pressure.
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About Cardiovascular System
The cardiovascular system covers the chambers, valves and major vessels of the heart, the cardiac cycle, conduction pathway, blood pressure and the circulation through pulmonary and systemic circuits. It also explains artery, vein and capillary structure, exchange at capillary beds, and how the cardiac cycle differs from general blood flow.
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