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What event is responsible for the pacemaker potential in the SA node? A. slow leakage or movement of Na+ ions into the cells B. activation of voltage-gated K+ channels that allow K+ to enter the cells C. activation of voltage-gated Ca++ channels that allow Ca++ to exit the cells D. slow leakage or movement of K+ ions out of the cells E. activation of voltage-gated Cl- channels.

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