Where are the heart cells with the fastest rate of action potential initiation localized?

Name: Where are the heart cells with the fastest rate of action potential initiation localized?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

The SA node, located in the right atrium, is responsible for initiating the action potential that ultimately leads to a cardiac contraction. It has the fastest rate of action potential initiation, typically firing at a rate of 60-100 times per minute, hence it is considered to be the natural pacemaker of the heart.

Where Are the Heart Cells with the Fastest Rate of Action