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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>