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Succus entericus term for the sum total of intestinal secretion. Crypts of Lieberkuhn secrete intestinal juice
Succus entericus also called intestinal juice is a fluid that is secreted in small quantity in the small intestine.
The secretions of the brush border cells of the mucosa alongwith the secretions of the goblet cells constitute this intestinal juice.
It is highly variable in constitution, and contains various enzymes (such as erepsin, lipase, lactase, invertase, enterokinase, dipeptidases, nucleosidases and maltase) and mucus.
Brunner's glands are the glands present in the walls of the duodenum, a part of small intestine. Brunner's glands secrete watery substance called as mucoid fluid.
This is an alkaline secretion which is viscous in nature.
It does not have any enzymes but it helps in protecting the inner walls of the intestine from the acidic activity of the chyme received from the stomach.
Answer : (a)