Human Brain Essay

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Human brain Every animal you can think of -- mammals, birds, reptiles, fish, amphibians -- has a brain. But the human brain is unique. Although it's not the largest, it gives us the power to speak, imagine and problem solve. It is truly an amazing organ. Structure Drawing of the human brain, showing several important structures The adult human brain weighs on average about 3 lbs. (1.5 kg) with a volume of around 1130 cubic centimetres (cm3) in women and 1260 cm3 in men, although there is substantial individual variation. The living brain is very soft, having a consistency similar to soft gelatin. Despite being referred to as "grey matter", the live cortex is pinkish-beige in color and slightly off-white in the interior. The brain performs an incredible number of tasks including the following: • It controls body temperature, blood pressure, heart rate and breathing. • It accepts a flood of information about the world around you from your various senses (seeing, hearing, smelling, tasting and touching). • It handles your physical movement when walking, talking, standing or sitting. • It lets you think, dream, reason and experience emotions. All of these tasks are coordinated, controlled and regulated by an organ that is about the size of a small head of cauliflower. The brain is hard-wired with connections, much like a skyscraper or airplane is hard-wired with electrical wiring. In the case of the brain, the connections are made by neurons that link the sensory inputs and motor outputs with centers in the various lobes of the cerebral cortex. There are also linkages between these cortical centers and other parts of the brain. Several areas of the cerebral cortex have specialized functions: Parietal lobe -- The parietal lobe receives and processes all somatosensory input from the body (touch, pain). Frontal lobe -- The frontal lobe is involved in

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