The brain and the spinal cord are the two main parts of the autonomic nervous system.

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The brain and the spinal cord are part of the central nervous system, which is responsible for processing and coordinating sensory input and motor output. The autonomic nervous system is a separate division of the peripheral nervous system, which controls involuntary actions such as breathing, heart rate, and digestion. The autonomic nervous system is further divided into the sympathetic and parasympathetic branches.

The Brain and the Spinal Cord Are the Two Main