First heart sound occurs during the period of________________?
Correct answer: C. Isovolumetric contraction
- A. Isotonic relaxation
- B. Isovolumetric relaxation
- C. Isovolumetric contraction
- D. Isotonic contraction
Explanation
The first heart sound is caused by closure of the atrioventricular valves at the beginning of ventricular systole. This occurs during isovolumetric ventricular contraction, before the semilunar valves open.
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