explain electron trnasport system and oxidation phosphorylation?

@Vitashi, Vineeta has answered correctly.

I would like to add some more about electron transport system..

NADH and FADH₂ are oxidised to release the energy stored in them through the electron transport scheme (ETS). In the ETS, the electrons are passed from one carrier to another, and finally to oxygen, resulting in the formation of water.

Electrons produced by NADH in the mitochondrial matrix are oxidised by Complex I (NADH dehydrogenase). Electrons are then transferred to ubiquinone, located in the inner mitochondrial membrane. Ubiquinone receives reducing equivalents through Complex II (FADH₂). Reduced ubiquinone (ubiquinol) is then oxidised by the transfer of electrons from Complex III (cytochrome bc 1 complex) to cytochrome c. Cytochrome c transfers the electrons between Complex III and Complex IV (Cytochrome c – oxidase complex consists of cyt a and a 3, along with two copper centres). In the course of passing from one carrier to another, electrons couple with Complex V (ATP synthase) and produce ATP. Oxidation of 1 NADH produces 3 ATPs. Oxidation of 1 FADH₂ produces 2 ATPs. Role of oxygen in the terminal stage of ETS: It acts as the final hydrogen acceptor; removes hydrogen from the process and drives the whole process.