... a momentary shortage of oxygen to the brain. Fainting is your body's way of getting you to lie down, so that oxygen-carrying blood can quickly get back to your brain. By collapsing to the ground, your head and heart are on the same level. This means your heart does not have to work as hard to push blood up to the brain, and you should return to consciousness after a few seconds. (4) Coma A coma, sometimes also called persistent vegetative state, is a profound or deep state of unconsciousness. An individual in a state of coma is alive but unable to move or respond to his or her environment. Coma may occur as a complication of an underlying illness, or as a result of injuries, such as head trauma. Even though those in a coma lose their higher brain functions, other key functions such as breathing and circulation remain relatively intact. ...

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