Session 1 - Purpose of the gut Flashcards
Describe the two different types of contraction in the stomach
Upper area creates basal tone with slow, sustained contractions
Lower area does powerful, grinding peristaltic contractions
Describe mechanisms of chemical digestion
Amylase and lipase in salvia, acid and pepsin in stomach, exocrine pancreas produces factors for digestion in duodenum
Infection defences
HCL, peters patches, kupffer cells in liver, and saliva
Where are peters patches mostly located
Terminal ileum
Name four types of GI movement
Mass movement, peristalsis, segmentation, haustrla shuttling
Name one temporary GI fold and one permanent
Rugae in stomach are temporary
Plicae circularis in SI are permanent
What is mass movement
Sudden movement of waste through colon into rectum
Rectum is normally empty/full
Empty
Purpose of upper oesophageal sphincter
Prevents air from entering GI tract
Role of lower oesophageal sphincter
Prevents oesophageal reflux
What factor does the stomach secrete
Intrinsic factor- vital for absorption of vit b12
How does the duodenum handle the acidic chyme it receives
Secretes HCO3
Site of b12 absorption
Terminal ileum
Which absorbs more nutrients, jejunum or ileum
Jejunum
Which absorbs more water/electrolytes, jejunum or ileum
Ileum
Where is site of bile recirculation?
Ileum
What happens in the large bowel?
Final water and final electrolyte absorption
Where absorbs the most water?
Small intestine (even though it’s the LIs main job)
Why is it difficult to absorb water in the LI
You’re going against the waters concentration gradient
Are the viscera in the peritoneal cavity?
No. nothing in there apart from small amount of fluid it secretes for lubrication. Organs are enveloped only
What is the mesentery
Double fold of peritoneum, blood vessels travel in here
