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Explain heart sounds....

Explain heart sounds.

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### Step-by-Step Solution: 1. **Understanding Heart Sounds**: The heart produces sounds due to the opening and closing of its valves. These sounds are crucial indicators of heart function. 2. **Types of Heart Sounds**: There are two primary heart sounds, commonly referred to as "lub" and "dub." These sounds are produced during the cardiac cycle. 3. **First Heart Sound (Lub)**: The first sound, known as "lub," occurs when the bicuspid (mitral) and tricuspid valves close. This sound marks the beginning of ventricular contraction (systole). ...
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