why humans cannot live without oxygen?
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Humans are aerobic creatures, meaning we require oxygen to release energy and exist. Without oxygen, our cells wouldn't be able to release the energy in the food we eat, and we would die. We take in oxygen through respiration — we move air in and out of the lungs, and blood takes oxygen to the cells of the body.
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Without oxygen, the human body can only survive for a few minutes before the biological processes that power its cells begin to fail. The electrical signals that power the neurons in the brain decrease and eventually stop altogether.
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