what is brain

The brain is a complex organ that controls various bodily functions, including thought, memory, emotion, touch, motor skills, vision, breathing, temperature, and hunger. It is the seat of intelligence, interpreter of the senses, initiator of body movement, and controller of behavior. The brain is composed of the cerebrum, brainstem, and cerebellum, each with its own special responsibilities. The cerebrum, the largest part of the brain, performs higher functions like interpreting touch, vision, and hearing, and is responsible for intellectual activities, memories, planning, imagination, and recognition. The brain is made up of neurons, glial cells, blood vessels, and nerves, and weighs about 3 pounds in the average adult. It is also composed of about 60% fat, with the remaining 40% being a combination of water, protein, carbohydrates, and salts. The brainstem, located at the top of the spinal cord, controls vital functions such as breathing, heart rate, and the diameter of blood vessels. Overall, the brain is a vital organ that controls thoughts, memory, speech, movements, and the function of many organs within the body.