So it only harvests a very small amount of potential energy that is stored in the bonds of glucose. And to actually be able to collect the remaining energy stored in the chemical bonds of glucose, we have to undergo aerobic cell respiration. And this only takes place in the presence of oxygen and if we have mitochondria in the cells of our body, because remember, certain cells don't actually have mitochondria. For instance, red blood cells don't have mitochondria, and so they cannot actually undergo aerobic cell respiration. So the majority of the high energy ATP molecules generated in breaking down glucose are produced via aerobic respiration, which must take place in the presence of oxygen and inside the mitochondria of our cell. So let's take a look at the following diagram.