Role of molecular oxygen in ETC is
As it turns out, the reason you need oxygen is so your cells can use this molecule during oxidative phosphorylation, the final stage of cellular respiration. ... Oxygen sits at the end of the electron transpo chain, where it accepts electrons and picks up protons to form water
Transfer of reducing equivalent to CoQ
Transfer of reducing equivalent from cytosol to mitochondria
To act as electron acceptor
Generation of ATP
Respiratory chain