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<font color="white" size=".72c">Our body is made up of trillions of cells. They
all require energy to function. This energy is </font>
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<font color="white" size=".72c">created within ourselves, in the mitochondria.
Here, food is converted into chemical energy </font>
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<font color="white" size=".72c">called ATP. ATP is released by the mitochondria,
so cells can use it. Mitochondria consists of two </font>
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<font color="white" size=".72c">membranes, an outer membrane separating it from
the cytosol, and an inner membrane surrounding </font>
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<font color="white" size=".72c">the so called matrix. The area between these
membranes is called the inter membrane space. ATP </font>
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<font color="white" size=".72c">is generated at the inner membrane of mitochondria
by an efficient mechanism called oxidative </font>
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<font color="white" size=".72c">phosphorylation, involving several membrane
protein complexes. Nutrients provide high-energy </font>
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<font color="white" size=".72c">electrons in the form of NADH, which are used by
the protein complexes to pump protons from the </font>
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<font color="white" size=".72c">matrix to the intermembrane space. This continuous
pumping, creates a proton gradient, where the </font>
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<font color="white" size=".72c">positively charged protons are attracted to the
more negative matrix. When the protons re-enter </font>
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<font color="white" size=".72c">the matrix through the ATP synthase protein
complex, they catalyze the production of ATP.</font>
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