. If we give an injection of acetylcholine to a person, rate of heart beat will a. Increase b. Decrease c. Increases first then decreases d. No effect on heart beat

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Muskan Anand

1 year ago

Option B.Acetylcholine slows the heart rate by activating the M2 muscarinic receptor (M2R) that, in turn, opens the acetylcholine-activated potassium channel (IK,ACh) to slow the firing of the sinus node.

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