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11 September, 15:42

What actions of the heart make the first and second sound of a heartbeat?

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  1. 11 September, 18:05
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    The first sound results from closure of the mitral and tricuspid valves, which separate the upper and lower chambers of the heart. The second sound occurs as a result of closure of the pulmonic and aortic valves. Blood travels across these valves on its way to the lungs and heart.
  2. 11 September, 19:04
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    Closure of the mitral and tricuspid valves, and closure of the pulmonic and aortic valves.

    Explanation:

    The first sound results from closure of the mitral and tricuspid valves, which separate the upper and lower chambers of the heart. The second sound occurs as a result of closure of the pulmonic and aortic valves. Blood travels across these valves on its way to the lungs and heart.
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