Single Choice Type When an action potential is initiated by SAN, which one of the following do n...

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Single Choice Type
When an action potential is initiated by SAN, which one of the following do not occur?
(1) Both atria contract simultaneously.
(2) Blood flow from atria to ventricles increases by \( 60 \% \).
(3) Blood from atria to ventricles passes through atrioventricular valves.
(4) Volume of atria decreases.
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