Physiology 3120 Lecture Notes - Lecture 3: Paneth Cell, Intestinal Gland, Goblet Cell
2 Apr 2017
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Jejunum: many villi to increase sa for optimal absorption, most absorption occurs here. Ileum: less villi but can still absorb nutrients if necessary, transporter of vitamin d3 in gi is found here, bile is reabsorbed here and recycled. Layers of small intestine: mucosa, types of epithelial cells vary with many absorptive. Will not acid (bc intestines can"t stand acid) Have lots of transporters to allow for absorption of different nutrients: folds called plicae (not shown in diagram) Get closer together when the small intestine diameter gets smaller: submucosa, same as stomach, muscularis externa, same as stomach, except only have longitudinal and circular (no oblique, serosa, same as stomach. Cell types of the small intestine: absorptive cells, epithelial cells with microvilli, lots of transporters for absorption of different nutrients, goblet cells, secretes mucus, chyme can be abrasive to wall. Intestinal gland cells: secretes alkaline watery mucus, neutralize acid coming from stomach, paneth cells, secretes lysozyme (destroy lysozymes)
