What are redox reactions ?

Explanation

`NAD^(+) + 2bare +2H^(+) rarr NADH + H^(+)`
`FAD + 2bare + 2H^(+) rarr FADH_(2)`
When `NAD^(+)` (Nicotianmide 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 `FADH_(2)` respectively. When they drop electrons and hydrogen off they go back to their original form. The reaction in which `NAD^(+)` and FAD gain (reduction) or lose (oxidation) electrons are called redox reaction (Oxidation reduction reaction). These reactions are important in cellular respiration.