NADH is a coenzyme that functions as a reducing agent. It carries electrons from one reaction to another.
NAD+: The oxidized form of NADH; acts as an electron acceptor.
Redox Reactions: Chemical reactions involving oxidation or reduction; these reactions involve transfer of electrons between two species.
Oxidative Phosphorylation: The metabolic pathway where cells use enzymes to oxidize nutrients and release energy which is used to reform ATP.