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Lelechka [254]
3 years ago
15

Why does the first heart sound occur after the qrs complex?.

Health
1 answer:
Paha777 [63]3 years ago
7 0

Answer:

QRS represents ventricular depolarization. This depolarization initiates ventricular contraction which closes the mitral and tricuspid valves. It is the closure that is heard as the first heart sound.

Explanation:

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