The sympathetic nervous system
A)is always excitatory for smooth muscle
B)innervates only tissues concerned with protecting the body against challenges from the outside environment
C)dominates in rest-and-digest situations
D)contains cholinergic and adrenergic fibers
E)stimulates only effectors that are dually innervated

Question

Quizplus · Accepted Answer

The sympathetic nervous system contains both cholinergic and adrenergic fibers, which produce different effects on different types of tissues. Cholinergic fibers release acetylcholine, which is generally excitatory, while adrenergic fibers release norepinephrine, which can be either excitatory or inhibitory depending on the type of receptor it activates. The sympathetic nervous system is not always excitatory for smooth muscle, does not only innervate tissues concerned with protecting the body against challenges from the outside environment, does not dominate in rest-and-digest situations, and does not stimulate only effectors that are dually innervated.

The Sympathetic Nervous System