KINESIOL 1AA3 Lecture 13: Topic 13
18 Apr 2016
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Document Summary
Parts of the colon: ascending, transverse, External anal sphincter: voluntary, skeletal muscle. Surrounds the colon: complete layer of circular muscle. Formed by contraction of the teniae coli: creates a puckered appearance. Sacs attached to the haustra: unknown function. Converts chyme into feces: stored and eliminated. Feces contains water, undigested food, microorganisms and epithelial cells: sometimes contains diarrhea, occurs when water is not absorbed by the digestive tract. Crypt components: goblet cells (most abundant, absorptive cells, granular cells. Microorganisms epithelial layer: synthesize vitamin k, breaks down cellulose into glucose, produces flatus (gas) Peristaltic waves: the primary mover in the ascending colon. Mass movements: the primary mover in the transverse/ descending colon. Initiated in the stomach: triggered by the presence of food. Initiated in the duodenum: triggered by the presence of chyme. Occurs when feces enters the rectum: causes distention of the walls, triggers the reflex. Local reflexes: weak contractions of the distal colon and rectum, relaxation of the internal anal sphincter.
