An investigator is developing a drug that results in contraction of the pupillary dilator muscle when instilled topically. The drug works by increasing neurotransmitter release from the presynaptic nerve terminal. When administered intravenously, this drug is most likely to have which of the following additional effects?
- A)Acceleration of gut peristalsis
- B)Relaxation of the bladder neck sphincter
- C)Release of epinephrine by the adrenal medulla
- D)Secretion of sweat by exocrine glands
- E)Increase in pyloric sphincter toneGABARITO
Explicação
The pupillary dilator muscle is innervated by postganglionic sympathetic fibers originating from the superior cervical ganglion. Contraction occurs when norepinephrine is released from these fibers and activates alpha-1 adrenergic receptors. Since this drug ca... Ver explicação completa e trilha adaptativa →