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The first heart sound results from the c...

The first heart sound results from the closure of semilunar valves.

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**Step-by-Step Solution:** 1. **Understanding Heart Sounds:** - The heart produces two main sounds during its cycle, commonly referred to as "lub" and "dub." These sounds are associated with the closing of heart valves. 2. **Identifying the First Heart Sound:** - The first heart sound, known as "lub," is produced by the closure of the atrioventricular (AV) valves. These valves are located between the atria (auricles) and the ventricles. ...
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Assertion : The pause between the end of the second sound and the beginning of the first sound coincides with ventricular diastole. Reason : The second sound (dupp) is created by the closure of the semilunar valve.

Assertion : LUBB (First Sound) is of shorter duration and sharp sound. Reason : It is created by the closure of the semiluar valves.