Each cardiac contraction follows a precise sequence. At time=0, atrial activation begins when the AV node depolarizes.

Name: Each cardiac contraction follows a precise sequence. At time=0, atrial activation begins when the AV node depolarizes.
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Question

Quizplus · Accepted Answer

Atrial activation begins with the depolarization of the SA node, not the AV node. The SA node's depolarization causes the atria to contract, and the impulse then travels to the AV node.

Each Cardiac Contraction Follows a Precise Sequence