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Your brain is your most powerful organ, yet weighs only about three pounds. It has a texture similar to firm jelly. The cerebrum fills up most of your skull. It is involved in remembering, problem solving, thinking, and feeling. It also controls movement. The cerebellum sits at the back of your head, under the cerebrum. It controls coordination and balance. The brain stem sits beneath your cerebrum in front of your cerebellum.
When you are thinking hard, your brain may use up to 50 percent of the fuel and oxygen. With each heartbeat, arteries carry about 20 to 25 percent of your blood to your brain, where billions of cells use about 20 percent of the oxygen and fuel your blood carries. The whole vessel network includes veins and capillaries in addition to arteries. Your brain's wrinkled surface is a specialized outer layer of the cerebrum called the cortex. Scientists have "mapped" the cortex by identifying areas strongly linked to certain functions.
Your brain is divided into right and left halves. Experts are not certain how the "left brain" and "right brain" may differ in function. In most people, the language area is chiefly on the left. Branches connect the nerve cells at more than trillion points. Scientists call this dense, branching network a "neuron forest. Signals traveling through the neuron forest form the basis of memories, thoughts, and feelings. The real work of your brain goes on in individual cells.
The neurotransmitters travel across the synapse, carrying signals to other cells. Scientists have identified dozens of neurotransmitters. Alzheimer's disease disrupts both the way electrical charges travel within cells and the activity of neurotransmitters. Signals that form memories and thoughts move through an individual nerve cell as a tiny electrical charge.