Two types of glands are found in the small intestine

1. Brunner's glands which are confined to the duodenum and secrete bicarbonate and mucus.

2. The intestinal cells which are present throughout the small intestine and secrete mucus and a few enzymes.

The intestinal juice or succus entericus produced by the intestinal glands has an electrolyte composition similar to that of extracellular fluid. It has a pH of 7.5 to 8.0. The only enzyme of importance in the succus entericus is enteropeptidase (enterokinase) derived from the microvillous membrane, which converts trypsinogen to trypsin.

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