The central nervous system (CNS) contains a number of components that perform specific functions within the body. Some functions, such as breathing, swallowing, and blood circulation, are involuntary, or done without conscious control. Which part of the CNS is responsible for these functions?

The brain stem controls vital involuntary functions such as breathing, swallowing, and regulating blood circulation. The cerebrum is involved in conscious thought and voluntary actions, while the hippocampus is important for memory and the cerebellum coordinates movement. Therefore, the correct choice is the brain stem.

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