BRAIN DEATH : Brain death is the irreversible end of all brain activity (including involuntary activity necessary to sustain life) due to total necrosis of the cerebral neurons following loss of brain oxygenation. It should not be confused with a persistent vegetative state. Patients classified as brain dead can have their organs surgically removed for organ donation. Even after brain death, the working of the heart might continue at a slow pace, but there will be no respiratory effort. Brain death, either of the whole brain or the brain stem, is used as a legal indicator of death in many jurisdictions. Brain injuries from direct head trauma, bleeding in and around the brain from blood vessels, or acute lack of oxygen as a result of a cardiac or respiratory arrest may lead to an increase in the pressure inside the skull which causes a coma. When the brain is injured it swells just as any part of the body does. The skull contains the brain, its blood supply and the cerebral spinal fluid. The pressure inside the skull is held in a delicate balance by the normal volumes of these three components. If there is an increase in the volume of one component that is not offset by a decrease in the other components the pressure inside the skull will rise. This increase in pressure could lead to a decrease to the oxygen supply and b rain cells begin to die after minutes when starved of oxygen, resulting in permanent brain damage. If the brain swelling increases it can push the brain downwards onto the brain stem, which is where the spinal cord and brain join at the back of the neck. When this happens, vital brain stem functions, which are necessary for life, stop. The brain stem controls our breathing, our heart rate, and our blood pressure and body temperature. Brain cells cannot regrow or be replaced. Unlike coma, brain death is irreversible.WEAR HELMET.... SAVE UR LIFE.... the soul it doesnt belong to U alone its for ur family also..... may we pray fr all to live happily..... !!!
Posted on: Fri, 25 Oct 2013 15:18:24 +0000
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