- Intestinal juice
Intestinal juice (succus entericus) refers to the clear to pale yellow watery secretions from the glands lining the
small intestinewalls. Secretion is stimulated by the mechanical pressure of partly digested food in the intestine.
Its function is to complete the process begun by
pancreatic juice; the enzyme trypsinexists in pancreatic juice in the inactive form trypsinogen, it is activated by the intestinal enterokinasein intestinal juice. Trypsin can then activate other protease enzymes and catalyze the reaction pro-colipase --> colipase. Colipase is necessary, along with Bile Salts, to enable Lipasefunction.
Intestinal juice also contains
hormones, digestive enzymes, mucus, substances to neutralize hydrochloric acidcoming from the stomachand erepsinwhich further digests polypeptides into amino acids, completing proteindigestion.
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