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2 ATP are used to split a glucose into two pyruvates. This creates 4 ATP with a net gain of 2 ATP.

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The pyruvates are used to create electron carriers NADH and FADH2. This also makes 2 ATP and 6 CO2.

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The NADH and FADH2 are sent to the ETC. Electrons are sent through the ETC by O2. It attracts the electrons and moves them towards the ATP synthase.

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The electrons travel to the ATP synthase. Here, they are used to make ATP. This also creates 6 H2O.

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Glycolysis: the cytoplasm

Krebs Cycle: the mitochondrial matrix

ETC: the intermembrane space of the mitochondria

ATP Synthase: The cristae