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The rhythm of the heart is set by the:
The rhythm of the heart is set by the:
A . AV node
B . SA node
C . purkinje fibers
D . Heart valves
Answer: B
Explanation:
The sinoatrial node (SA) is the main pacemaker of the heart, often initiating cardiac contraction due to generating impulses faster than other pacemaker areas. The SA is referred to as the primary pacemaker.
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