1106BiologyMedium
“lub” sound is produced after _________ ?
AThe ventricles are fully contracted
BThe bicuspid and tricuspid valves suddenly close
CThe semilunar valves are closed
DThe ventricles start to relax
Correct answer
B. The bicuspid and tricuspid valves suddenly close
Explanation
The bicuspid and tricuspid valves suddenly close is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.