We have to consider that capillaries are blood vessels where our blood can move throughout our whole bodies nourishing each tissue with oxygen, but also carrying other nutrients, such as glucose to perform metabolic processes, like cellular respiration, so we can say that capillaries both oxygen and reabsorb nutrients. This can be done because the cells after performing those processes, can send out those products present in the intracellular media outside the cells via vesicles done by the Golgi apparatus. Eventually, these materials will be conducted through specialized capillaries known as lymphatic vessels, suspended in a fluid known as lymph, which is a liquid our bodies produce to carry out these substances, such as proteins and fats, but also white blood cells. And in this metabolic process of nourishment, enzymes produced in the pancreas but also in the small intestine, such as lactase, and sucrase will be crucial to catabolize the aliments that will give start to these set of reactions. This can be graphically represented as the following picture does, especially focusing in the stomach, the pancreas, and the small digestive intestine: