1. Mucosal epithelium has goblet cells which secrete mucus that help in lubrication. 2. Mucosa forms crypts in between the bases of villi in the intestine called crypts of Lieberkuhn. Regarding 1 and 2 :
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There are four layers of food canal 1,mucosa,2,sub mucosa,3.muscular layar.4.sirosa
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