What function does the nervous system primarily serve?

The nervous system primarily serves the function of controlling body movements, which is a fundamental aspect of its role. It works by transmitting signals between different parts of the body, including the brain, spinal cord, and peripheral nerves. This signaling allows for voluntary movements, like walking or writing, as well as involuntary movements, such as reflexes and muscle contractions.

By integrating sensory information from the environment, the nervous system enables organisms to react to stimuli appropriately. It also plays a crucial role in coordination, balance, and maintaining posture through the continuous processing of information and feedback from the body.

While the other choices touch on vital bodily functions, they do not encompass the primary role of the nervous system. Detoxification is mainly handled by the liver and kidneys; digestion primarily involves the gastrointestinal system; and nutrient storage is largely a function of the liver and adipose tissues. Thus, the control of body movements stands out as the main function directly related to the workings of the nervous system.