the small intestine absorbs almost all types of foods. if the food is not absorbed here, then it will go out of the body on a free trip. it absorbs proteins (amino acids), fats (glycerol), starch (glucose), sugars. and all other nutrients that are necessary for the body functioning.
The anus is merely a sphincter, it cannot digest or absorb anything. It is possible to introduce substances through the anus into the large intestine, which does have the capacity to absorb water or substances dissolved in water; it does not have the capacity to digest anything, however. Digestion takes place in the stomach and the small intestines, not in the large intestines.
Villi
Your small intestines absorb the food and nutrients as well as the water you take in. You can not survive without most of it.
absorb food nutrients
villi
they get passed through small vessals into your blood.
the small intestines can't absorb nutrients as well
the villi in the small intestines.
Simple columnar epithelial tissue.
Villi
Lymphatic vessels serve to absorb fat molecules from the small intestines.
The small intestines come first because they absorb the nutrients of the food we eat.