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Which Structure in the Heart Initiates Action Potentials That Stimulate

Question 56

Multiple Choice

Which structure in the heart initiates action potentials that stimulate contraction of the heart at constant rate of about 100 beats per minute?

A) Cardiac accelerator nerves
B) Atrioventricular node
C) Cardiovascular center
D) Sinoatrial node
E) Bundle of His

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