Gall Bladder -- stores and concentrates bile for release into the duodenum.

Examine sections of gall bladder and see if you can identify

• The major layers and the differences within the layers found along the GI tract.
• Note the prominent mucosal folds.
• Also note the type of epithelium lining the lumen and its very thin basement membrane.

How does the histology of this mucosa facilitate the gall bladder’s function?

Clinical note: A common disorder of the gallbladder is cholelithiasis or the formation of gallstones. These are concretions of cholesterol monohydrate, calcium salts, and phospholipid which can cause painful inflammation of the gallbladder and/or obstruction of the cystic duct and distention of the gallbladder. Treatment often involves surgical removal of the gallbladder.

Now for the respiratory system.