NEET · BiologyEasy
The heart sound known as 'lub' is associated with the closure of which valves?
- A.Semilunar valves
- B.Aortic valves
- C.Atrioventricular valves
- D.Pulmonary valves
Show correct answer & step-by-step solution
Correct answer: C — Atrioventricular valves
Solution
- The first heart sound is lub and the second is dub.
- Lub occurs at the start of ventricular systole.
- This sound is caused by the closure of the tricuspid and bicuspid valves.
- These are collectively known as the atrioventricular valves.
- Hence the answer is (C).
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