Question

Choose the correct answer from the alternatives given.
The typical lub-dub sounds heard in the heart beat of a healthy person are due to:

• A. closing of the semilunar valves
• B. closing of the tricuspid and bicuspid valves
• C. closing of the tricuspid and bicuspid valves followed by the closing of the semilunar valves
• D. blood flow through the aorta

Answer 1

The correct option is C closing of the tricuspid and bicuspid valves followed by the closing of the semilunar valves

Heart sounds are noises generated by the closing and opening of the heart valves. In a healthy individual, there are two normal heart sounds called lub and dub. Lub is the first heart sound. It is associated with the closure of the tricuspid and bicuspid valves at the beginning of systole. The second heart sound dub is associated with the closure of the semilunar valves at the beginning of diastole.

So, the correct option is 'closing of the tricuspid and bicuspid valves followed by the closing of the semilunar valves'.