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The closure of the atrioventricular valves marks the start of

User Chfw
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the start of ventricular systole
User Tushar Kesare
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Answer:

systole

Step-by-step explanation:

The first heart sound (S1) represents closure of the atrioventricular (mitral and tricuspid) valves as the ventricular pressures exceed atrial pressures at the beginning of systole (point a).

User Kkrugler
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