Deck 6: Acetylcholine Receptor Agonists

Question 1

A patient with open-angle glaucoma receives a drug that activates muscarinic receptors in the eye.Which action is responsible for the therapeutic effect of this drug?

A) contraction of ciliary muscle
B) relaxation of ciliary muscle
C) contraction of iris sphincter muscle
D) relaxation of iris sphincter muscle
E) stimulation of lacrimal gland secretion

Answer 1

contraction of ciliary muscle

Question 2

Which mechanism is responsible for the therapeutic effect of sildenafil?

A) inhibition of acetylcholine degradation
B) activation of muscarinic acetylcholine receptors
C) inhibition of cyclic GMP degradation
D) stimulation of nitric oxide synthesis
E) stimulation of potassium efflux

Answer 2

inhibition of cyclic GMP degradation

Question 3

Which adverse effect may result from administration of bethanechol?

A) dry mouth
B) urinary retention
C) pupil dilation
D) tachycardia
E) diarrhea

Answer 3

diarrhea