In addition to mucus, the intestinal mucosa produces two other types of secretions. Copious amounts of the serous-type fluid are secreted to act as a:
A) Vehicle for absorption
B) Enzyme that splits sugars
C) Protection from acid content
D) Parasympathetic stimulation
Ans: A
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An isotonic alkaline fluid is secreted by crypts of Lieberkühn in the intestinal mucosal layer at a high rate, to secrete mucus, electrolytes, and water and to act as a vehicle to aid absorption. Surface enzymes split sugars. Parasympathetic stimulation increases secretion of mucus. Brunner glands secrete large amounts of alkaline mucus to protect the duodenum from acid content.
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