Body Fluids and Circulation · NEET Preparation Zoology
Match the heart sounds with the mechanical events that cause them:
Practice question from Body Fluids and Circulation (NEET Preparation Zoology), with the correct answer and a step-by-step solution.
medium · MCQ · Q-1D5AA1
Match the heart sounds with the mechanical events that cause them:
- A.First sound (lubb) due to closure of semilunar valves; second sound (dub) due to closure of AV valves
- B.First sound (lubb) due to closure of AV valves; second sound (dub) due to closure of semilunar valvesCorrect answer
- C.First sound (lubb) due to opening of AV valves; second sound (dub) due to opening of semilunar valves
- D.First sound (lubb) due to atrial contraction; second sound (dub) due to ventricular contraction
Solution
The first heart sound (lubb) is associated with the closure of the tricuspid and bicuspid (AV) valves, whereas the second heart sound (dub) is associated with the closure of the semilunar valves.
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