LAB - GI System Flashcards
Four layers of the GI tract
- mucosa: epithelium, lamina propria, muscularis mucosa
- submucosa
- muscularis propria: inner circular layer of SM, outer longitudinal
- adventitia (CT only) or serosa
serosa
CT lined with mesothelium
four main types of cell in the gastric mucosa
- mucous cells - mucous
- parietal cells - HCl, KCl, electrolytes, gastric IF
- chief cells - pepsinogen, lipase
- cells of the diffuse endocrine system - gastrin
six different cells in the small intestine
- absorptive
- goblet cells
- Paneth cells
- diffuse endocrine cells
- intraepithelial lymphocytes
- stem cells
where are Brunner’s glands found
submucosa of Duodenum
T or F. As you progress down the GI tract, the goblet cells decrease in number
F! increase
appendix
- histologically resembles the large intestine
- no significant digestive or absorptive function
acid produced by goblet cells
mucin
largest gland in the body
liver
parenchyma
functional cells of the organ
functional cells of the liver
hepatocytes
stroma
refers to the connective tissue of the organ
hepatic portal vein
- delivers a supply of blood directly from the GI tract
- rich in absorbed food products but poor in oxgen
hepatic artery
supplies liver with oxygen-rich blood
components of the portal triad
- hepatic portal vein
- hepatic artery
- bile duct
- may also contain lymphatic vessels*
wall of gallbladder has four layers
- mucosa
- submucosa
- muscularis: arranged in longitudinal, oblique, and transverse layers, but layers NOT distinct
- serosa
T or F. portal triads have connective tissue surrounding them
T! while central veins/terminal hepatic venules have very little connective tissue around them
this staining method outlines the microscopic structure of the liver
reticulin stain
hepatic vein
responsible for venous drainage
