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The Sinoatrial Node Is the Heart's Normal Pacemaker Because

Question 23

Multiple Choice

The sinoatrial node is the heart's normal pacemaker because


A) it has the fastest natural rate of autorhythmicity.
B) it has both sympathetic and parasympathetic innervation.
C) it lies in the right atrium.
D) activation of K+ channels occurs more rapidly in this region than elsewhere in the heart.
E) none of these answers.

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