Integrated Response to a Meal Flashcards
What is the surface cell lining from the oropharynx down to colon?
Simple squamous
- Oropharynx
- Upper 1/2 esophagus
Columnar
- Lower 1/2 esophagus
- Stomach
- Small intestine
- Colon
Where are interstitial cells of cajal found?
Throughout entire GI system, pacemaker cells for entire GI
What cells are found in the gastric pits in the stomach?
G cells
Parietal Cells
ECL cells
What key cells/structures are found in the small bowel?
Brunner’s glands
Villi and crypts
Paneth cells
Goblet cells
ECL cells
What key cells are found in the colon?
Goblet cells
ECL cells
Lymphoid tissue
What key events occur in the stomach?
- IF is secreted
- Iron is converted from ferric (3+) to ferrous (2+)
- Pepsin digests proteins
- NSAIDs and EtOH absorbed
What key events occur in the duodenum?
- AAs absorbed
- Mono- and disaccharides absorbed
- Iron absorbed
- Na+, Ca2+ Mg2+ absorbed
What key events occur in jejunum?
- Water soluble vitamins absorbed (B,C)
- Fat soluble vitamins absorbed (ADEK)
- Folate absorbed
- FFAs absorbed
- Monoglycerides absorbed
- Peptides absorbed
- Water absorbed
What key events occur in the ileum?
- Vitamin B12 absorbed
- IF absorbed
- Vit C absorbed
- Bile acids absorbed
- Water absorbed
What key events occur in the colon?
- Short chain FAs produced from bacteria and absorbed
- Vit K absorbed
- Water absorbed
- Na+ and Cl- absorbed
Explain what is happening during the cephalic phase of digestion.
Explain what is happening during the gastric phase of digestion.
Explain what is happening during the early intestinal phase of digestion.
Explain what is happening during the late intestinal phase of digestion.
