HTHSCI 1H06 Lecture Notes - Lecture 16: Brush Border, Jejunum, Ileum
14 Apr 2018
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Document Summary
Small intestine: to the basic plan: villi, microvilli, plicae circularis. Villi finger-like projections that come off the plicae circularis increase surface area. Plicae circularis: brush border increase surface area, part of intestinal cells folds that take a circular shape increases surface area for digestion and absorption, 3 parts: duodenum, jejunum & ileum. Plicae circularis (not as dense as the duodenum) Aggregations of lymphoid tissues (b and t cells present) to remove pathogens that try to enter the small intestine (also called malt or. Gastroileal reflex - long-acting neural reflex signals down to distal portion of ileum to clear out the ileum to prep for incoming meals. Brunner"s gland present (discussed below: secretes bicarbonate-rich mucus. Secretin triggers release of bicarb-rich fluid from pancreas: cck triggers release of pancreatic enzymes (lipases, proteases, carb breaking enzymes, two patterns of motility (segmentation, mmc, segmentation - fed pattern.
