Where does the oxygen used in cellular respiration end up?

Question 4 options:

water

ATP

NADH

glucose

Oxygen used in cellular respiration ends up in ATP Synthesis in Oxidative Phosphorylation.

Explanation:

Since oxygen is the last electron acceptor in Electron transfer chain, the H ions flow through ATP synthase for ATP synthesis. The electrons from the NADH and FADH are pumped from the matrix of mitochondria to inter-membrane space. The energy released due to the proton gradient formed is used for making ATP.