What structure is known as the "pacemaker" of the heart because it starts the action potential that triggers each heartbeat?
A. atrioventricular (AV) node
B. sinoatrial (SA) node
C. Purkinje fibers
D. Bundle of His (AV bundle)
Answer: B. sinoatrial (SA) node
Anatomy & Physiology
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Fill in the blank(s) with correct word
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