If the cell doesn't do it, the body doesn't either.
The cell's mitochondria produce energy through respiration (glycolysis, Kreb's cycle, oxidative phosphorylation), which requires oxygen. It's no coincidence that the "macro-process" of breathing is also called respiration.
Most people think that the most essential substance for life is water. Not so! Water is actually a "waste" product of respiration.
The most essential substance for life is OXYGEN. Without it cells begin to die in seconds. Glucose is next in importance but it takes much longer for cells to starve than to suffocate. Breathing is job #1!!!
So, be good to your lungs and they'll never let you down. Or out!
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