Autonomic Nervous System Fibers are Involved in All of the Following

Question

Autonomic nervous system fibers are involved in all of the following except __________.
A) changing the diameter of the pupil
B) adjusting heart rate and force
C) altering salivary mucus secretion
D) regulating gastrointestinal motility
E) maintaining tonicity of the muscles of the neck

Accepted Answer

The autonomic nervous system is involved in regulating the diameter of the pupil, heart rate and force, salivary mucus secretion, and gastrointestinal motility. However, maintaining tonicity of the muscles of the neck is not a function of the autonomic nervous system. Instead, it is regulated by the somatic nervous system.