Why does the electron transport chain produce water

I know how it produces it, I would just like to know why it produces water.

Thanks so much!

The function of the whole mechanism of cellular respiration is to make ATP from the energy released by oxidizing glucose molecules. The oxidation of glucose is accomplished by removing the hydrogen atoms from the glucose carbon atoms. The hydrogen atoms have to go someplace where they are more stable (lower energy) and stay there - or else they will never leave the glucose carbons.

So the hydrogens from the glucoses are attached to oxygen atoms (the ones we breathe), which forms water (H2O). And water molecules contain about the lowest amount of energy of any molecule around..

This is the same thing that happens when glucose or any other organic molecule is burned in a flame. Uses oxygen, produces CO2 and H2O, and releases energy - as heat and light, in that case.

There has to be a final acceptor which is oxygen.