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The human brain weighs about 1.4 kilograms (three pounds) and has three main parts. The largest part is the cerebrum. The cerebrum takes care of thinking, remembering, and moving other body parts. It lies towards the front and top of the head. The second part, the cerebellum, is behind and below the cerebrum. It helps with balance. The remaining section is the brain stem, which controls breathing and other automatic actions. You’re usually not thinking about your heart beating or your lungs taking in air, but your brain stem makes all that happen.