What is one function of the peripheral nervous system?

The peripheral nervous system (PNS) plays a vital role in connecting the central nervous system (CNS), which includes the brain and spinal cord, to the rest of the body. One of its primary functions is to transmit sensory information from various parts of the body to the brain, and to relay motor commands from the brain to the muscles and glands. This bidirectional communication is essential for responding to stimuli, coordinating voluntary and involuntary actions, and maintaining overall body function.

In contrast, the other functions described—processing information within the brain, regulating internal organ functions, and directing immune responses—are associated with distinct systems. For instance, processing information is primarily a function of the CNS, while the regulation of internal organ functions falls more under the autonomic nervous system's purview. Directing immune responses is managed by the immune system, not by the nervous system. Therefore, the correct answer emphasizes the crucial role of the peripheral nervous system in facilitating communication between the body and the brain.