The next big topic that we're going to focus on will be glucose metabolism. And in this lecture, I'd like to basically introduce what this concept actually is, what it involves and what it attempts to actually achieve. So let's begin by describing, generally speaking, what glucose metabolism is. 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.