Stephens LEC 1: Overview and Structure of GI Tract Wall
Last Modified: 2016-03-08
The movement of products of digestion across a layer of epithelial cells into the blood or lymph.
Contractions of smooth muscle in the GI tract wall to mix and move the luminal contents.
Ingested material that was neither digested nor absorbed (most of that is called fiber) and bacteria.
Fiber includes cellulose from plant walls, pectins and many other substances.
-Chewing breaks food into smaller pieces
-Secretion of saliva (salivary glands)
-Initiation of swallowing reflex
-Dissolves some of the food molecules so that food can be tasted
-It moistens and lubricates the food before swallowing
-It contains amylase which partially digests starch
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