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

User Rohit Pareek
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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.

Step-by-step explanation:

User YoryeNathan
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