NEETZoologyBody Fluids and Circulation
What is the second heart sound (dub) associated with?
Options
- AThe closure of the tricuspid and bicuspid valves
- BThe closure of the semilunar valves
- CThe opening of the tricuspid and bicuspid valves
- DThe opening of the semilunar valves
Correct answer
B. The closure of the semilunar valves
Step-by-step solution
During each cardiac cycle two prominent sounds are produced which can be easily heard through a stethoscope. The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves whereas the second heart sound (dub) is associated with the closure of the semilunar valves . These sounds are of clinical diagnostic significance.