Question

Short / Long type answer type questions.

What caused the production of the first sound in the heart?

Answer 1

• 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.