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The brain stem controls the flow of messages between the brain and the rest of the body, and it also controls basic body functions such as breathing, swallowing, heart rate, blood pressure, consciousness, and whether one is awake or sleepy.
Added 8/3/2016 3:37:40 AM
This answer has been confirmed as correct and helpful.
Confirmed by
selymi [8/3/2016 3:41:47 AM]