The inner mitochondrial membrane can be disrupted into five sepa- rate protein complexes, called Complexes I, II, III, IV, and V. Complexes I–IV each contain part of the electron transport chain (Figure 6.8). Each complex accepts or donates electrons to relatively mobile electron carriers, such as coenzyme Q and cytochrome c. Each carrier in the electron transport chain can receive electrons from an electron donor, and can subsequently donate electrons to the next carrier in the chain. The electrons ultimately combine with oxygen and protons to form water. This requirement for oxygen makes the electron transport process the respiratory chain , which accounts for the greatest portion of the body’s use of oxygen.
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smelly_compost - (no access) - Lippincott's Biochemistry.pdf, p82
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