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

Question

Biology

Edwin Shelton

11 September, 15:42

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

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Answers (2)

Know the Answer?

Herring · Answer 1

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.

Alicia Kramer · Answer 2

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.