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Chain of electron transfer The electron transport chain is the final stage of the respiration route, and it is where the most ATP molecules are produced. The electron transport chain is a group of proteins located on mitochondria's inner membrane. The hydrogen ions and electrons are released into the transport chain by NADH.

An electron transport chain (ETC) is a collection of protein complexes and other molecules that transfer electrons from electron donors to electron acceptors via redox reactions (both reduction and oxidation occur at the same time) and couple this electron transfer with proton (H+ ion) transfer across a membrane. The electron transport chain contains many membrane-bound enzymes.

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