Question

Which of the following statements is true of the group of fibers indicated by the letter D?

Options:
A) D indicates fibers that mediate the long-lasting effects of the parasympathetic division.
B) D indicates fibers that stimulate the release of acetylcholine into the bloodstream from the adrenal gland.
C) D indicates fibers that bypass collateral ganglia and terminate within the adrenal gland.
D) All the listed statements regarding the fibers at D are correct.

Answer 1

The correct statement about the group of fibers is option C, where D indicates preganglionic sympathetic fibers that innervate the adrenal gland, leading to the release of adrenaline into the bloodstream.

Step-by-step explanation:

The statement that is true of the group of fibers indicated by the letter D is option C: D indicates fibers that bypass collateral ganglia and terminate within the adrenal gland. These fibers are part of the sympathetic nervous system and are specifically preganglionic sympathetic fibers. Unlike other postganglionic fibers in the sympathetic nervous system that release norepinephrine, these preganglionic sympathetic fibers release acetylcholine (ACh) which stimulates the adrenal medulla to release epinephrine (adrenaline) and norepinephrine into the bloodstream. This is part of the body's "fight-or-flight" response, which is characterized by actions that prepare the body for situations that require immediate and vigorous activity.