PHGY 210 Lecture Notes - Lecture 28: Motility, Ileum, Mucin
Mar 17, 2017
Summary of Lecture #5
How and When does Large Intestine Empty its Contents?
-2-3x a day, corresponding to intake of new meal, increased activity in colon and distal SI
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Interdigestive Period
-GI Motility organized into intense pattern of cyclic myoelectric (motor) activity
a) recurring at regular intervals
~90 minutes
b) moving sequentially over distal stomach and small intestine up to distal ileum
~2-10 cm/minute
MMC (Migrating Myoelectric (Motor) Complex)
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MMC
-restricted to distal stomach and S.I.
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Document Summary
2-3x a day, corresponding to intake of new meal, increased activity in colon and distal si. Gi motility organized into intense pattern of cyclic myoelectric (motor) activity: recurring at regular intervals. ~90 minutes: moving sequentially over distal stomach and small intestine up to distal ileum. Chemical breakdown of food to progressively smaller molecules. Results from secretory activity of large number of exocrine glands found w/in and in association w/ git. Secretions are released into lumen of digestive tract. Secretion is an active, energy dependent and blood flow dependent process, resulting in release of fluid containing ions and variety of enzymes. 3 types of enzymes: amylases, proteases lipases. Gastric glands in fundus and corpus (not responsible for this level of detail) This causes more co2 to diffuse in from plasma (together w/ cellular metabolic co2) combines w/ water in presence of carbonic anhydrase to produce h2co3.
