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Q:

Which one is the first heart sound?

  • 1
    Lub during closure semilunar valves
  • 2
    Lub during closure of atrio-ventricular valves
  • 3
    Dub during closure of atrio- ventricular valves
  • 4
    Dub during closure of semilunarvaleves
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Answer : 2. "Lub during closure of atrio-ventricular valves"

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