Question

question
the effects produced by sympathetic postganglionic fibers in spinal nerves include which of the following?
select all that apply
contraction of the urinary bladder during urination
stimulation of secretion by sweat glands
increase in the activity along the digestive tract
dilation of the pupils and focusing of the eyes

Explanation:

• Sympathetic postganglionic fibers in spinal nerves are part of the autonomic nervous system.
• Contraction of the urinary bladder during urination is mainly mediated by the parasympathetic nervous system, so this is incorrect.
• Sympathetic postganglionic fibers do stimulate secretion by sweat glands.
• Sympathetic activity generally decreases (not increases) activity along the digestive tract, so this is incorrect.
• Sympathetic postganglionic fibers cause dilation of the pupils and help in focusing (in a fight - or - flight response context).

Answer:

B. Stimulation of secretion by sweat glands, D. Dilation of the pupils and focusing of the eyes