"lubb" sound is produced due to___________________?
Correct answer: B. Closure of inlet valve
- A. Opening of inlet valve
- B. Closure of inlet valve
- C. Opening of outlet valve
- D. Closure of outlet valve
Explanation
The lubb sound occurs when the atrioventricular, or inlet, valves close at the beginning of ventricular systole. Their closure prevents backflow into the atria, whereas closure of the outlet valves produces the dubb sound, making d the likely error.
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