Digested food in the midgut. The stomach of most mammals, reptiles and an additional area of mucous membrane of the heart near the entrance, Super Flora Probiotics also secrete mucus and bicarbonate ions. See esophagus Midgut or small intestine is the main site for the digestion of food and absorption of nutrients. Lined and a single layer of cells that secrete mucus and fluid, it contains enzymes that help in the final stages of carbohydrates and protein digestion, and absorption of nutrients from the lumen in the circulatory system. And it can increase the surface area of the Lmah by a variety of means, such as the folds of the doorman (blind sacs) in fish. In higher vertebrates is increased from the surface of the .