Explain ETS.

Explanation

`NADPH + H^+` or `FADH_2` formed in glycolysis and Mitochondrial matrix are oxidised through .the electron transport system and the electrons are passed on to `O_(2)` resulting in the formation of `H_(2)O`. The metabolic pathway through which an electron passes from one carrier to another is called electron transport system.
`NADPH +H^(+)` is oxidised and releases electrons in the presence of NADH dehydrogenase (complex I), which are transferred to ubiquinone located with in the inner membrane. Ubiquinone also receives reducing equivalents via `FADH_2` (Complex II). The reduced ubiquinone (Ubiquinol) is oxidised and releases electrons which are accepted by cytochrome `c_(1)`, Cytochromec (Complex III), cytochrome C is a smalLprotein, acts as a mobile carrier for the transfer of electrons between complex III and IV to cytochromes a and `a_3`, finally reaches `1/2O_(2)` along with `2H^+`, produce `1 H_2O` molecule. During this electron flow, `10H^+` moves from matrix to inner mitochondrial membrane [`4 H^+` at complex I, `4H^+` at complex III, 2 at complex IV]. As a result `H^+` concentration increases towards the inner membrane of mitochondria. So the `H^+` comes back to the matrix side through ATPage [`F_0, F_1`], involves in the synthesis ATP.