Which description best fits the autonomic nervous system?

• A. Coordinates voluntary movement only
• B. Controls involuntary functions
• C. Is responsible for reflex arcs only
• D. Connects the CNS to skeletal muscles

Answer: (B)

The autonomic nervous system is the part of the nervous system that runs the body's automatic functions. It manages processes you don’t consciously control, such as heart rate, digestion, breathing rate, pupil size, and gland secretions, adjusting them as needed to maintain balance in the body. Because these activities happen largely outside awareness, the autonomic system operates involuntarily.

This fits best because the other descriptions describe different parts or aspects of nervous system function. Coordinating voluntary movement and connecting the CNS to skeletal muscles are tasks of the somatic nervous system, not the autonomic. Reflex arcs can involve automatic responses, but they aren’t the defining feature of the autonomic system, which is focused on regulated, automatic control of internal functions.