So we see that the liver is not only an endocrine gland, it is also an exocring gland. And we'll see what that means in just a moment. Now, another important structure that functions with the liver is known as the gallbladder. And we'll see what the gallbladder does in just a moment. So let's begin by discussing function number one. So the liver functions in macromolecule metabolism, so the metabolism of carbohydrates of fats and proteins.