Medicine

What does the brain do?

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The brain is the supervisory center of the nervous system in all vertebrates. It also serves as the site of emotions, memory, self-awareness, and thought. By means of electrochemical impulses the brain directly controls conscious or voluntary behavior, such as walking and thinking. It also monitors, through feedback circuitry, most involuntary behaviorÑconnections with the autonomic nervous system enable the brain to adjust heartbeat, blood pressure, fluid balance, posture, and other functionsÑand influences automatic activities of the internal organs. There are no pain receptors in brain tissue. A headache is felt because of sensory impulses coming chiefly from the meninges or scalp.

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