Question

Which type of nerve fibers are not found in smooth muscle?

O preganglionic parasympathetic fibers
O preganglionic sympathetic fibers
O postganglionic sympathetic fibers
O postganglionic parasympathetic fibers

Answer 1

Preganglionic parasympathetic fibers are not found in smooth muscle.

Step-by-step explanation:

Preganglionic parasympathetic fibers are not found in smooth muscle. Preganglionic parasympathetic fibers are part of the autonomic nervous system and play a crucial role in regulating involuntary bodily functions. These fibers originate from the brainstem and the sacral region of the spinal cord and form connections with ganglia, which are clusters of nerve cell bodies. In the case of preganglionic parasympathetic fibers, the ganglia are typically located near or within the target organ.

These fibers release the neurotransmitter acetylcholine, which binds to receptors on the postganglionic fibers and elicits responses in the target tissues, such as smooth muscles, glands, and cardiac muscle.