The brain is part of which system in the body?

The brain is an integral part of the central nervous system (CNS), which also includes the spinal cord. The CNS is responsible for processing information and coordinating activities throughout the body. It plays a crucial role in controlling most bodily functions, including thought processes, emotional regulation, sensory perception, and motor functions. The brain acts as the control center, receiving sensory input, generating responses, and facilitating communication between various parts of the body through the nervous system.

The other systems mentioned, such as the peripheral nervous system, include nerves outside the CNS that connect the limbs and organs to the brain and spinal cord, while the endocrine system involves glands that release hormones affecting various bodily functions, and the immune system protects the body against disease. However, the brain's primary role within the central nervous system specifically solidifies its classification under this system.