Acetylcholine binds to a GPCR on heart muscle. The activated receptor stimulates a trimeric Gi protein, which opens a K channel in the plasma membrane. Following stimulation with Acetylcholine, what impact on heart rate would you expect from each of the following?

Generates a reduction in heart rate.

Explanation:

These channels, initially called K (Ach), slow the pacemaker cell's depolarization and decrease the heart rate.

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