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Name two heart sounds....

Name two heart sounds.

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**Step-by-Step Solution:** 1. **Identify the Question**: The question asks for the names of two heart sounds. 2. **First Heart Sound**: The first heart sound is known as "Lubb" (or "S1"). This sound is produced during the closure of the atrioventricular (AV) valves, which include the mitral valve and the tricuspid valve. 3. **Second Heart Sound**: The second heart sound is referred to as "Dubb" (or "S2"). This sound occurs during the closure of the semilunar valves, which are the pulmonary valve and the aortic valve. ...
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