The Human Body

The control of our body is our Brain. The brain is a complex system containing billions of nerves that can process information from our bodies, operate our internal organs, generate thoughts and emotions, store and recall memories, and control movement all at the same time. Scientist have studied the brain for centuries, and are no where near to fully understanding it. Our brain is a wrinkled, jelly-like mass weighing about 3 pounds. Its divided into 4 main sections called ,The brain stem, cerebellum, diencephalon and the cerebrum. The brain is the organ that makes us human. It’s also responsible for each individual’s personality, memory, movements and how we sense the world. The brain is our biggest organ. A healthy brain can operate quickly and automatically. Normal functions can be disrupted by disease or trauma. As we age the brain deteriorates naturally, making us   more venerable to problems You can have a stroke which occurs when   blood supply to a part of the brain is suddenly cut off, either by a clot or a burst of blood vessel. Another disease that can effect the brain is Alzheimer’s. Alzheimer’s kills brain cells, affecting memory, Alzheimer’s can also be very fatal. You can also get Brain tumors. Tumors occur when cells lose their ability to control their growth.   Our body’s engine is our heart. The heart is responsible for pumping life-sustaining blood(sixty thousand mile long network of blood vessels.) The heart works all the time, beating one-hundred thousand times per day, forty million times a year, in total about three billion heartbeats over an average lifetime. The heart keeps the body freshly supplied with oxygen and nutrients, while clearing away harmful waste matters.   The heart circulates nearly   two gallons of blood through the body. The system begins in the lungs, where blood picks up oxygen. The heart takes oxygen-rich blood from the lungs and pumps it out to all parts of the body. After the body’s cells take oxygen from the blood, the...