EMT Emergency Care 68W Practice Test

The peripheral nervous system (PNS) is defined by its role in connecting the limbs and organs to the central nervous system (CNS), which consists of the brain and spinal cord. This system includes all the nerves that branch out from the CNS and extend to other parts of the body, facilitating communication between the brain and every other part.

The PNS is subdivided into the somatic nervous system, which controls voluntary movements, and the autonomic nervous system, which manages involuntary functions. By connecting peripheral parts of the body, such as muscles, organs, and glands, to the CNS, the PNS plays a crucial role in how the body responds to stimuli, demonstrates reflexes, and carries out essential functions.

In contrast, characteristics such as containing the brain and spinal cord pertain to the CNS, while processing sensory information is a function that can also occur within the CNS, specifically in the brain after sensory signals from the PNS are transmitted. The notion that the PNS only regulates autonomic functions is incorrect as it encompasses a broader range of functions, including voluntary motor control. Therefore, the selected characteristic accurately reflects the primary role of the peripheral nervous system.