Acetylcholine slows the heart because it
A) opens potassium ion channels in SA node cells.
B) opens sodium-calcium ion channels in SA node cells.
C) causes the pacemaker potential to depolarize more quickly.
D) causes the pacemaker potential to depolarize more slowly.
E) opens potassium ion channels in SA node cells and causes the pacemaker potential to depolarize more slowly.
Answer: E
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