(i) Intestinal juice contains mucus. Mucus protects the intestinal wall from the action of enzymes.
(ii) Enterokinase in intestinal juice converts inactive trypsinogen to trypsin.
(iii) Maltase in intestinal juice converts maltose, sucrase converts sucrose and lactase converts lactose to glucose.
(iv) Peptidase enzyme in this juice converts polypeptides into amino acids.