ANSC 2340 Chapter Notes - Chapter 16: Short-Chain Fatty Acid, Enteropeptidase, Alpha Cell
24 Jan 2017
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The innermost layer of the gi tract wall. Contains blood and lymph vessels, and glands. From mucosa into folds, increases the surface area for absorption. Inner circular and outer longitudinal smooth muscle. Skeletal muscle can also present in the esophagus and in the sphincter of anus. Last layer of the gi tract wall. For the part of gi tract that is suspended from the body cavity. Called adventitia if the gi tract is surrounded by other tissue. Controls both motor and sensory functions of the gi tract. Afferent neurons send information to the cns. Between the circular and longitudinal smooth muscle. Controls the movement of the gi tract. E. g. hormone cholecystokinin inhibits gastric emptying, gastrin stimulates. Secrete hormones directly into the bloodstream and carry out function at a specific site. Secrete substances into the interstitial fluid, which travel by diffusion, and only affect nearby cells. Vestibule: the space between the outer surface of the teeth and lips/cheeks.
