Final answer:
The brain is part of the central nervous system, which also includes the spinal cord. Together, they control both involuntary and voluntary processes within the body.
Step-by-step explanation:
The part of the central nervous system that is being asked about in this question is the brain. The central nervous system (CNS) consists of the brain and the spinal cord, which are crucial for regulating and controlling bodily functions. The brain is the control center of the nervous system, and it is protected inside the skull, whereas the spinal cord is protected within the vertebrae. These two components work together to manage everything from involuntary actions, like heart rate and breathing, to complex cognitive processes such as thinking and learning.