Sympathetic responses generally are widespread because ________.
A) inactivation of ACh is fairly slow
B) NE and epinephrine are secreted into the blood as part of the sympathetic response
C) preganglionic fibers are short
D) preganglionic fibers are long

Question

Quizplus · Accepted Answer

NE (norepinephrine) and epinephrine are released from the adrenal gland into the bloodstream as part of the sympathetic response. This allows them to affect a large number of target tissues throughout the body. In contrast, the effects of ACh (acetylcholine), which is used by preganglionic and postganglionic fibers in the sympathetic and parasympathetic divisions, are more localized because its inactivation is fairly slow. Additionally, while preganglionic fibers in the sympathetic division are relatively short, postganglionic fibers can be quite long, further contributing to the widespread effects of sympathetic responses.

Sympathetic Responses Generally Are Widespread Because ________