What is primarily controlled by the somatic nervous system?

The somatic nervous system is primarily responsible for the voluntary control of skeletal muscles. It facilitates intentional movement, allowing individuals to perform actions such as walking, writing, or any other physical activity that requires conscious effort. This system includes motor neurons that transmit impulses from the central nervous system to the muscles, enabling voluntary muscle contractions.

Unconscious bodily functions, such as digestion and heart rate, are mainly regulated by the autonomic nervous system, not the somatic. Pupil response is controlled by the autonomic nervous system as well since it involves involuntary responses to light changes. Hormone secretion is similarly governed by the endocrine system and not directly by the somatic nervous system’s control over voluntary muscle movements. Thus, the correct choice highlights the primary function of the somatic nervous system in facilitating voluntary actions.