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We wouldn't be able to use oxygen to burn fuel to produce energy. In our cells this takes place in specialized organelles called mitochondria, which organize the enzyme pathways needed to run the Krebs Cycle, which transfers electrons from food to oxygen and generates 32 molecules of the currency of energy, ATP, from each food molecule.

The whole anatomical structure of the Respiratory System - trachea, lungs, etc. - exists just to deliver oxygen in a timely manner to those mitochondria.

Without it, our cells would have to get by on the ancient system of Fermentation, which is what cells used prior to Earth's having an oxygen-rich atmosphere, billions of years ago. Fermentation only yields 2 ATP per sugar molecule, as opposed to 32. You can see why respiration became preferred by Evolution!

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14y ago
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Anonymous

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3y ago
badest thing ever AND its wrong
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14y ago

it is simple we can't breath and live.

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Q: What would happen if there was no system for respiration n the body?
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In the lungs. That's where gas exchange and respiration takes place


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