(Nicotinamide Adenine Dinucleotide-oxidised form) and FAD (Flavin Adenine
Dinucleotide) pick up electrons and one or two hydrogen ions (protons), they
get reduced to NADH + H+ and FADH2 respectively. When
they drop electrons and hydrogen off they go back to their original form. The
reaction in which NAD1 and FAD gain (reduction) or lose (oxidation)
electrons are called redox reaction (Oxidation reduction
reaction). These reactions are
important in cellular respiration.