13. Gut flux and motility Flashcards
primary peristaltic wave
forces the bolus down the esophagus and into the stomach
wave lasts about 8–9 seconds
secondary peristaltic wave
In the event that the bolus gets stuck
a secondary peristaltic wave occurs
forces the bolus further down the esophagus
waves continues until the bolus enters the stomach
What part of the brain controls the process of peristalsis?
medulla oblongata
5 Functions of the Fundus (Proximal stomach)
1) Gastro duodenal flow
2) Intragastric pressure
3) Temporary storage
4) Tonic motor activity
3) Stimulates propulsion
What % of body weight does the pancreas represent
0.1%
How may enzymes does the pancreas release?
15 digestive enzymes
4 Functions of the small bowel
Lymphoid tissue
Absorption
Immune function
Digestion
Where is Lymphoid Tissue concentrated
Terminal ileum
Tonsils
3 Functions of the large bowel
Salvage of water and electrolytes
Absorption of undigested carbohydrates
Secretion of mucus
How is the small bowel adapted for Immune function?
MALT (GALT) made up of B and T cells
Peyer’s patches (discrete clusters of immune cells)
Secretory IgA
How is the small bowel adapted for Absorption
Microvilli = large S.A
Motility = allows contact of contents with absorptive surfaces
Where is majority of iron absorbed?
Duodenum
Where is majority of folate absorbed?
Jejunum
Where is majority of B12 absorbed?
Ileum
Where does majority of water absorption occur?
ascending and transverse colon
What 4 factors determine Fluid Absorption?
Luminal Osmolarity
Motility
Mucosal Integrity
S.A
Oral intake of fluid a day
2L
Biliary fluid entering a day
0.5L
Pancreatic fluid entering a day
1L
Intestinal fluid entering a day
1L
