Mixture of Endogenous and Exogenous Protein in the Alimentary Tract

摘要: Ingestion of any meal sets off a series neural, hormonal, chemical and me chanical stimuli which excite salivary, gas tric, hepatic, pancreatic intestinal se cretory cells to pour out enzyme other proteins into the lumen digestive tract. The magnitude these responses indicates large rapid turnover protein in glandular tissues di gestive hydrolytic enzymes, secreted proteins, sloughed mu cosa provide enough endogenous amino acids mixture gut obliterate unique character istics acid derivable solely from ingested exogenous (Nasset et al., '55). A calculation made composition 5 enzymes suggested that is mixed with at least an equal mass pro tein (NA¤sset, '57). feeding test meals containing C14-labeledcasein, as de scribed present paper, provides more direct approach this problem. results indicate small intestine en dogenous than was previously sug gested. Some work appeared preliminary report.1 METHODS