A drug decreases heart rate by blocking a receptor on cardiac muscle cells.This drug probably binds to: A)a₁receptors. B)fi₂receptors. C)fi₁receptors. D)nicotinic cholinergic receptors.

Question

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The drug is decreasing heart rate by blocking a receptor on cardiac muscle cells. The options given are: fi₂receptors, fi₁receptors, a₁_{receptors and nicotinic cholinergic receptors. Nicotinic cholinergic receptors are located on skeletal muscle cells and plays important role in muscle contraction. fi₂receptors and a₁}_{receptors are not relevant to cardiac muscle cells. However, the drug probably binds to fi₁receptors. These receptors are present on cardiac muscle cells and plays important role in regulation of heart rate. Therefore, option C is the correct choice.}

A Drug Decreases Heart Rate by Blocking a Receptor on Cardiac