Explain how electron are transported to the final electron acceptor.

The electrons are transported to the final electron acceptor through electron transport chain.

Electron Transport Chain (ETS)

• NADH and FADH₂ are oxidised to release the energy stored in them.

• 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 bc₁ complex) to cytochrome c.

• Cytochrome c transfers the electrons between Complex III and Complex IV (Cytochrome c − oxidase complex consists of cyt a and a₃, 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

For video, kindly refer the study material of chapter no. 14.