What is the primary function of the central nervous system?

The primary function of the central nervous system (CNS) is to process and interpret sensory information. The CNS, which consists of the brain and spinal cord, acts as the control center for the entire body, receiving input from various sensory organs and integrating this information to produce appropriate responses. It is responsible for higher cognitive functions such as decision-making, emotions, and processing complex sensory input, which allows us to interact meaningfully with our environment.

The other functions mentioned in the options relate to different aspects of the nervous system or other systems in the body. For instance, while muscle movement is indeed a consequence of CNS processing, it is not the primary function; rather, it is a result of the CNS sending signals to the peripheral nervous system, which then activates muscles. Supporting visceral functions typically falls under the domain of the autonomic nervous system, which operates largely outside of conscious control and is not the main role of the CNS itself. Releasing hormones into the bloodstream is a function of the endocrine system and not a primary responsibility of the CNS. Thus, the central nervous system's main role is in processing and interpreting sensory information, making it crucial for all cognitive and motor functions.