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

Explanation

Role of `O_(2)` in Aerobic Respiration
The respiration of glucose starts with glycolysis in cytoplasm, followed by in Krebs's cycle and finally Electron Transport Chain (ETC) in inner mitochondiral membrane. The requirement of `O_(2)` is at the end of ETC.
Where , it acts as final hydrogejn acceptor. `O_(2)` is responsible for removing electrons from the system. If oxygen is not available, electrons could not be passed through the co-enzymes, inturn proton pump will not be produced via oxidative phosphorylation. Thus Oxygen play a critical role in aerobic respiration in mitochondrial matrix.