Match heart characteristic with correct anatomical structure. Choices may be used more than once or not at all. -its fast Ca²⁺ channels help initiate A)tricuspid valve B)myocardium C)aortic semilunar valve D)AV node E)sinoatrial node

Question

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The characteristics mentioned match with the sinoatrial (SA) node, which is responsible for initiating the heartbeat and has fast Ca²⁺ channels. None of the other anatomical structures listed have these specific characteristics.

Match Heart Characteristic with Correct Anatomical Structure