Question
Biology Question on Human Endocrine System
The second heart sound (dubb) is associated with the closure of
A
tricuspid valve
B
semilunar valves
C
bicuspid valve
D
tricuspid and bicuspid valves
Answer
semilunar valves
Explanation
Solution
During beginning of ventricular diastole the ventricles relax and the semilunar valves are closed. This causes the second heart sound (dubb).