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Oxygen is critical for aerobic respiration. Explain its role with respect to ETS.

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NADH+, H+ and FADH2 are the carriers of energy in the electron transport system. These carriers are utilised to produce ATP during this process. Oxygen molecules accept electrons which are transferred to them through a series of reactions. Oxygen molecules accept the hydrogen molecules and lead to the formation of water molecules. This process is important for the aerobic respiration process.

The process of Oxidative phosphorylation involves the transfer of electrons which can be related to the flow of water through a tap. Just as in that case, the droplets cannot flow down until the first drop is allowed to pass through after the first electron is allowed, others follow when the oxygen starts accepting electrons as a hydrogen acceptor. That is the reason due to which the presence of oxygen is necessary for the electron transfer to be made possible by the creation of a gradient.

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