In SAN, when an action potential is initiated, which of the following do not occur? (A) Both atr...

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In SAN, when an action potential is initiated, which of the following do not occur?
(A) Both atria contract simultaneously.
(B) Blood flow from atria to ventricles increases by \( 60 \% \)
(C) Blood from atria to ventricle passes through atrioventricular valves.
(D) Volume of atria decreases.
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