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After passing through the electron transport chain, the "spent" electrons combine with oxygen to form water. This is why oxygen is needed, in the absence of oxygen, this process cannot occur.

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This causes a greater concentration of ions in the intermembrane space than in the matrix. This chemiosmotic gradient causes the ions to flow back across the membrane into the matrix where their concentration is lower.

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The energy captured is used to pump hydrogen ions (from NADH and FADH2) across the inner membrane, from the matrix into the intermembrane space.

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The Electron transport chains are located on the inner membrane of the mitochondria

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High energy electrons are released from NADH and FADH2, they are transported along the chains and some of their energy is captured.

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4 ATP (2 from Glycolysis)
10 NADH (2 from Glycolysis)
2 FADH2

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OAA is regernerated, the molecue that started the krebbs cycle.

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After citric acid forms, it goes through a series of reactions that releases energy. The energy is captured by NADH, ATP, and FADH2. Carbon Dioxide is a waste product of the reactions.

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Acetyl-CoA combines with a four carbon moleue, OAA (oxaloacetate) This produces citric acid, which is why the Krebbs cycle is also called The Citric acid cycle.

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The two molecues of pyruvic acid enter the matrix of a mitochondria.

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During this stage, high energy electrons are also transferred to molecues of NAD+ to produce two molecues of NADH, is used in stage 3 of cellular respiration to make more ATP

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The energy to split glucose is provided by two molecues of ATP. As glycosis proceeds, energy is released. The energy is used to make four molecues of ATP. As a result there is a net gain of two ATP molecues during Glycosis.

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Enzymes split a molecue of glucose into two molecues of pyruvate (also known as pyruvic acid.)

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There are two types of Cellular respiration, aerobic, where oxygen is present, and anaerobic, where oxygen is absent.