GIT

Lower GIT: small intestine & large intestine :

LEC .8 Small Intestine Monday 8 April 12 Objectives Physiological anatomy functions Intestinal secretion Intestinal motility

Intestinal secretion

Intestinal motility 1.Mixing contractions—segmentationBER which is about 12/min in the duodenum*8 contractions /min in distal ileum

Factors that enhance & inhibit intestinal emptying

1)Intense peristalsis in distal ileum
4)Gastrin secretion increase emptying by increasing perstalsis.
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2) Distention of the cecum increase contraction of I.C.S. cause inhibition of ileal perstalsis and emptying.
3) Inflammation of the appendix cause spasm of the ileocecal sphincter cause paralysis of the ileum block emptying (prevertebral sympathetic ganglia.