Question

what does the Lub Dub sound of the heart beat mean?​

Answer 1

Answer:

Normal heart sounds can be characterized by a "lub" "dub" that occurs with a heart beat. The first heart sound (lub) occurs when the atrioventricular (AV) valves close and the second heart sound (dub) is heard when the semilunar valves close.

Explanation:

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Answer 2

Answer:

Normal heart sounds can be characterized by a "lub" "dub" that occurs with a heart beat. The first heart sound (lub) occurs when the atrioventricular (AV) valves close and the second heart sound (dub) is heard when the semilunar valves close

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