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Digestion, moving on

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Parietal cells. Chief cells. Enteroendocrine cells. Submucosa. Muscularis. What goes down must come... Controlled by PNS (X), secretin, distension ... – PowerPoint PPT presentation

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Title: Digestion, moving on


1
Digestion, moving on
  • Karen Kraus
  • BIOL 204
  • November 6, 2007

2
Feeling it in the gut
3
Can you stomach this?
  • Mucosa
  • Gastric pits
  • Mucous neck cells
  • Parietal cells
  • Chief cells
  • Enteroendocrine cells
  • Submucosa
  • Muscularis

4
What goes down must come
  • Water, mucus, HCl, intrinsic factor, enzymes
  • Pepsin, rennin, lipase
  • Hormonal control
  • X (PNS)
  • celiac plexus (SNS)

5
Youve got some guts
6
The little things.
7
specialization
  • Mucosa
  • Crypts of Lieberkuhns
  • Paneth cells
  • Submucosa
  • Brunners glands
  • Peyers patches

8
Da juice
  • Mostly water
  • Barely basic
  • Enzymes
  • Enterokinase
  • Various disaccharidases
  • Peptidases
  • Lipases
  • Controlled by PNS (X), secretin,
    distension/irritation and acidity

9
With onions
  • Four lobes divided into lobules
  • Hepatocytes form bile
  • Sinusoids filter blood
  • Various functions
  • Gall bladder stores and concentrates bile until
    it is released

10
Bile
  • Water
  • HCO3-
  • Bile salts
  • Cholesterol
  • Bile pigments
  • Lipids/phospholipids
  • Lecithin
  • Other electrolytes
  • Emulsifies fats for lipase

11
Panacea
  • Endocrine and exocrine functions
  • Acinar cells are exocrine
  • HCO3-
  • Proteinases
  • Amylase
  • Exonucleases
  • Lipase

12
Its big!
13
colonoscopy
  • Symbiotic bacterial action
  • Water reabsorption
  • Electrolyte reabsorption
  • Feces formation

14
The end
  • Haustral contractions and mass movements
  • Defecation reflex
  • Distention
  • Contraction of the rectal muscles
  • Anal sphincters
  • Levator ani
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