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The body uses oxygen here, and only
here
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Humans, which are a collection of cells, breathe air (oxygen.) Without air,
humans cells die quickly. Here, within the cell's mitochondria, the body uses its air. In other words, this is the only time and place where the body uses the
oxygen we breathe. Nowhere else, but in the creation of cellular energy (ATP), does the
body use its oxygen.
The machine works like this. Within the many mitochondrion power plants there are many
engines creating power. Each engine cycles by burning the shipped-in fuel &
air supplies. The cycle takes in glucose & oxygen, and in the process of generating
energy, creates exhaust fumes & waste products. The exhaust fumes are carbon dioxide.
The waste product is water from cellular respiration.
In biochemistry, this cycle that prepares the fuel (glucose) to be burned and removes
the exhaust is called the Krebs cycle or the citric acid cycle.
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