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 ________.

Question

Quizplus · Accepted Answer

The drug causing pupil dilation by acting on acetylcholine receptors is a muscarinic blocking agent. Acetylcholine acts on muscarinic receptors in the eye to constrict the pupil, so blocking these receptors would cause dilation.

Acetylcholine Will Cause the Pupil of the Eye to Constrict