lub sound is produced after _________ ?
Tap an option to check your answer.
✅ Correct answer: C. The bicuspid and tricuspid valves suddenly close
Option A: The ventricles are fully contracted
Option B: The ventricles start to relax
Option C: The bicuspid and tricuspid valves suddenly close
Option D: The semilunar valves are closed
Correct Answer : The bicuspid and tricuspid valves suddenly close
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