Which body system is made up of three subsystems?

The nervous system is indeed comprised of three primary subsystems: the central nervous system (CNS), the peripheral nervous system (PNS), and the autonomic nervous system (ANS). The central nervous system consists of the brain and spinal cord, serving as the main control center for processing and transmitting information. The peripheral nervous system connects the CNS to the limbs and organs, carrying messages to and from the body. Finally, the autonomic nervous system regulates involuntary functions, such as heartbeat, digestion, and respiratory rate, further demonstrating the complexity and significance of the nervous system in overall body function. The distinction between these subsystems allows for specialized functions, coordination, and regulation essential to maintaining homeostasis and responding to external stimuli effectively.