One of the fundamental processes a living organism must carry out is breathing. This is the process that gets oxygen from the atmosphere to the body’s cells, and in particular the brain, through the lungs and red blood cells. The brain will fail if it does not receive oxygen for a period of 3 to 4 minutes. If an individual does not have a constant supply of oxygen they will lose consciousness, the heart will stop beating and the final result will be death.

There are three stages involved in the process of getting oxygen to the brain and they can be broken down into the ABC of life.

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