Acetylcholine slows the heart rate by
A) increasing the permeability to K+ and decreasing the permeability to Ca2+.
B) just increasing the permeability to K+.
C) just increasing ion influx, thus increasing the rate of depolarization.
D) just decreasing the permeability to Ca2+.
E) just increasing the permeability to Ca2+.
A) increasing the permeability to K+ and decreasing the permeability to Ca2+.
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