Protein is mostly absorbed in the small intestine, i.e. in the duodenum and jejunum. Dietary proteins are digested by proteases (proteolytic enzymes) present in the gastric juice in the stomach, i.e. pepsin and pancreatic juice in the small intestine, i.e. trypsin and chymotrypsin. Proteins are absorbed as amino acids, dipeptides or tripeptides by the brush border lining of the small intestine containing microvilli. Intestinal mucosa absorbs amino acids and di or tripeptides by diffusion or facilitated transport by carrier proteins to the blood and then transported to the liver.
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