NEETZoologyBody Fluids and Circulation
What is the first heart sound (lub) associated with?
Options
- AThe closure of the semilunar valves
- BThe closure of the tricuspid and bicuspid valves
- CThe opening of the semilunar valves
- DThe opening of the tricuspid and bicuspid valves
Correct answer
B. The closure of the tricuspid and bicuspid 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.