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A Certain Drug Decreases Heart Rate by Blocking a Receptor

Question 5

Multiple Choice

A certain drug decreases heart rate by blocking a receptor on cardiac pacemaker cells. This drug probably binds to ________ receptors.

A) nicotinic cholinergic
B) muscarinic cholinergic
C) alpha-1 adrenergic
D) alpha-2 adrenergic
E) beta-1 adrenergic

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