What is the primary function of the spinal cord?

The primary function of the spinal cord is to facilitate the transmission of neural signals between the brain and the body. It acts as the main pathway for information traveling to and from the brain, allowing for communication between the central nervous system and the peripheral nervous system. This includes transmitting sensory information from various parts of the body to the brain and relaying motor commands from the brain to the muscles, enabling movement and reactions.

Additionally, the spinal cord plays a crucial role in reflex actions, where it can initiate responses without direct involvement from the brain, thus ensuring rapid reactions to stimuli. This function underscores its importance in overall bodily coordination and response to environmental changes. The other options, while important functions within the body, do not capture the primary role of the spinal cord in facilitating communication between the brain and the body.