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Autorhythm

Adaptive test — questions are selected based on your ability estimate. — Tag: HeartbeatInit

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What event normally initiates each heartbeat?

Potassium ions leak out of SA node cells, reversing their resting membrane potential A nerve impulse arrives from the cardiovascular center in the brainstem A critical volume of blood fills the ventricles and triggers a stretch-activated contraction Sodium ions leak into SA node cells through specialized channels, causing the membrane potential to reach threshold

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