In normal adults, there are two usual heart sounds, generally illustrated as a lub and a dub, which takes place in sequence with every heartbeat. These are the first and the second heart sound generated due to the closing of the atrioventricular valves and semilunar valves respectively.

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Chapter 13, Problem 8E

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In normal adults, there are two usual heart sounds, generally illustrated as a lub and a dub, which takes place in sequence with every heartbeat. These are the first and the second heart sound generated due to the closing of the atrioventricular valves and semilunar valves respectively.

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