In the diagram of the heart action potential conduction system, the structure labeled A is called the ___, which spontaneously creates action potentials at a rate of approximately ___ times per minute.

Question

Quizplus · Accepted Answer

The structure labeled A is the sinoatrial (SA) node, which is responsible for initiating the electrical impulses that stimulate the heart to contract. The SA node generates action potentials at a rate of approximately 60 to 100 times per minute, making choice A the best answer.

In the Diagram of the Heart Action Potential Conduction System