Which type of division of the peripheral nervous system is primarily involved in voluntary movements?

The somatic system of the peripheral nervous system is primarily responsible for voluntary movements. It is composed of sensory and motor neurons that facilitate conscious control over skeletal muscles. When you decide to move your arms or legs, the motor neurons of the somatic nervous system are activated, sending signals from the central nervous system to the muscles, allowing for intentional actions.

This system is distinct from the autonomic system, which regulates involuntary bodily functions, such as heart rate and digestion, and does not engage in the direct control of muscles. The sympathetic system is a part of the autonomic system specifically involved in the body's "fight or flight" responses, which also does not pertain to voluntary movements. Lastly, while the peripheral system includes both somatic and autonomic divisions, it does not specifically indicate the control over voluntary movement that is characteristic of the somatic system.