Acetylcholine will cause the pupil of the eye to constrict. A drug acts on receptors for acetylcholine to cause the pupils of the eye to dilate. Nicotine does not bind to receptors in smooth muscle cells of the iris. Therefore, the drug which causes the pupils to dilate is a ________.

A. an adrenergic agent
B. a muscarinic agent
C. muscarinic blocking agent
D. a nicotinic agent
E. nicotinic blocking agent


Answer: C

Anatomy & Physiology

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