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It is secreted by the secretory glands of the stomach wall. It is highly acidic as it contains hydrochloric acid (HCl). It also contains enzymes like pepsin and renin. Both act on proteins. However, renin is present only in young children. It digests the milk proteins. Pepsin is secreted in its inactive form pepsinogen which becomes activated in acidic conditions.
It is secreted by the ileum region of the small intestine. Here the final stage of the digestion of different kinds of food takes place. It contains maltase to convert maltose to glucose; sucrase to convert sucrose to glucose and fructose; lactase to convert lactose to glucose; and galactose and erypsin to convert the proteoses, peptones and peptides into amino acids.
[Two or more amino acids join together to form peptides. Many peptides together form polypeptides which in turn form proteins. Proteoses and peptones are compounds that are structurally intermediate between proteins and peptides].
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