Okay glycoloysis: Occurs in the cytoplasm of living cells, it does not require oxygen, It is the breading down of glucouse to for pyruvate and ATP(2 per glucose molecule). I belive NAD takes away some H for later use aswell.
Kreb cycle: Via acetyl co-enzyme A pyruvate is broken down, Carbon dioxide is released and some more ATP. This process requires oxygen to be present but does not use oxygen itself. It occurs in the matrix of the mitocondria.
Electron transport chain: Oxygen acts as the last electron acceptor to for water, 34 atp is made at this stage(we are talking if we originall had one molecule of Glucose). This occurs in the cristae of the mitochondria.
This is to the degree we need to know the process in my course.