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Unformatted text preview: the blood when energy sources are needed elsewhere in the body. Proteins Proteins are split into small polypeptides by enzymes secreted by the stomach and pancreas, and on the surface of intestinal cells. Peptidases on the surface of intestinal epithelial cells complete the digestive process. Amino acids are absorbed into intestinal epithelial cells. Amino acids are actively transported into cells under the influence of growth hormone and insulin. Amino acids are used to build new proteins or as a source of energy. Water and Minerals Water can move either direction across the intestinal wall, depending on osmotic conditions. Approximately 99% of the water entering the intestine is absorbed. Most minerals are actively transported across the intestinal wall....
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- Fall '10