State the main compositions of gastric juice and explain the role of each
Answers
Mucus, bicarbonates, rennin, pepsinogen, HCl, small amount of lipases and intrinsic factor are the main components of gastric juice.
Mucus:- secreted by mucus neck cell or goblet cells.
Lubrication and protection of the mucosal epithelium from excoriation by the highly concentrated HCl.
Bicarbonates:- same as that of mucus.
Rennin:- proteolitic enzyme found in gastric juice of infants
which help in the digestion of milk proteins.
Pepsinogen:- Converted to active enzyme called pepsin by HCl.proteolitic enzyme.Convert proteins to proteoses and peptones(peptides).
HCl:- provides acidic pH(pH 1.8)
optimal for pepsins.
Lipases:- digestion of lipids.
Intrinsic factor:- essential for the absorption of vitamin B12.
gastric juice. gastric juice, thin, strongly acidic (pH varying from 1 to 3), almost colorless liquid secreted by the glands in the lining of the stomach. Its essential constituents are the digestive enzymes pepsin and rennin (see rennet), hydrochloric acid, and mucus.