What is the first heart sound (lub) associated with?

What is the first heart sound (lub) associated with?
  1. The closure of the semilunar valves
  2. The closure of the tricuspid and bicuspid valves
  3. The opening of the semilunar valves
  4. The opening of the tricuspid and bicuspid valves

Solution

The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves.

Asked in: NCERT

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