The ________ node of the heart initiates the electrical impulse that begins each heartbeat
A) atrioventricular
B) myocardial
C) bundle of His
D) sinoatrial
D
Explanation: A) The atrioventricular node does not initiate this electrical impulse.
B) There is no myocardial node.
C) The bundle of His does not initiate this electrical impulse.
D) Correct!
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