The knee permits the following movements: flexion, extension, as well as slight medial and lateral rotation. Also, the knee has special locking and unlocking mechanisms, related to movement by the femoral condyles on the tibial plateau.
H&E stain. Bile or gall is a dark green to yellowish brown fluid, produced by the liver of most vertebrates, that aids the digestion of lipids in the small intestine. In humans, bile is produced continuously by the liver (liver bile), and stored and concentrated in the gallbladder (gallbladder bile).
Physiology. 1  Bile acid actually refers to the unconjugated forms (produced in the liver from cholesterol and in the intestine, the latter by deconjugating action of enteric bacteria) 2  Bile salt more accurately refers to the conjugated form, which is produced in the hepatocyte.