What components make up the autonomic nervous system?

The autonomic nervous system (ANS) is a critical part of the peripheral nervous system and is responsible for regulating involuntary bodily functions, including heart rate, blood pressure, respiration, digestion, and sexual arousal. It is primarily composed of motor nerves that control the actions of internal organs, smooth muscles, and glands.

The correct choice highlights that the primary function of the autonomic nervous system is to utilize motor nerves to transmit signals that help regulate various involuntary physiological processes. These motor nerves are responsible for the autonomic control of organ systems, which operates independently of conscious control and includes both the sympathetic and parasympathetic branches of the nervous system.

Understanding that the autonomic nervous system primarily consists of motor nerves clarifies its function. Sensory nerves, reflex actions, or the inclusion of "other nerves" are elements involved in different nervous system functions or types, rather than being specific to the composition of the autonomic nervous system. Focusing on the motor aspect underscores the ANS's role in controlling involuntary actions rather than sensory inputs or reflex pathways.