So glucose metabolism is the process by which our body, ourselves, basically try to transform the energy that is stored in the chemical bonds of the sugar molecule, the glucose, into the energy that is stored in the bonds of ATP molecules. Because ultimately it's not the glucose molecules, but the ATP molecules that are used by the cells to carry out many different types of processes. For instance, creating electrochemical gradients by using membrane pumps or using ATP to basically contract muscle. So contraction of muscle, it can be skeleton muscle or cardiac muscle or smooth muscle, uses ATP molecules. Now, what types of processes actually make up glucose metabolism? So the first process that we're going to look at will be glycolysis.