Gastrointestinal System: Structure And Function

The primary functions of the gastrointestinal system are digestion, which is breaking down food that we eat into nutrients; absorption, which is getting those nutrients into the bloodstream; and excretion, which is getting rid of digestive waste as feces. As we get older, our gastrointestinal system becomes less efficient. Some of the changes include a reduction of saliva production as well as dental issues, such as tooth loss.