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10 protons are pumped by the membrane-associated electron transport system across the membrane for every molecule of NADH that is oxidized.
Two protons are pumped across the membrane by this last complex in the electron transport chain, which also completes the ultimate transfer of electrons to oxygen. NADH molecule enters the electron transfer chain after passing a total of 10 protons across the membrane.
The inner membrane of the mitochondria contains a number of chemical compounds and proteins that make up the electron transport chain. In a sequence of redox reactions, electrons are transferred from one component of the transport chain to another. In these processes, energy is released as a proton gradient, which is then utilized to produce ATP through a process known as chemiosmosis. Oxidative phosphorylation is a process that involves both chemiosmosis and the electron transport chain.
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