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The brain is the most complex part of the human body. This three-pound organ is the seat of intelligence, interpreter of the senses, initiator of body movement, and controller of behavior.he cerebrum sits at the topmost part of the brain and is the source of intellectual activities. It holds your memories, allows you to plan, enables you to imagine and think. It allows you to recognize friends, read books, and play games. The cerebrum is split into two halves (hemispheres) by a deep fissure.
How Your Brain Works. As you proceed up the evolutionary ladder from fish toward humans, check out the changes in the brain. For example, the cerebrum gets bigger, takes up a larger part of the total brain and becomes folded. The simplest possible creatures have incredibly basic nervous systems made up of nothing but reflex pathways. For example, flatworms and invertebrates don't have centralized brains.