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The Liver

 The liver is the largest gland in the body and is located just caudal to the diaphragm.

Main functions:

bulletmetabolism of proteins, fats and carbohydrates
bulletsynthesis of substances like proteins
bulletbile secretion - eliminates waste products and aids fat digestion
bulletdetoxification of foreign substances that have been ingested
bulletstorage of blood and various nutrients
bulletdestruction of worn out red blood cells

The portal vein carries nutrient-rich blood from the intestines directly to the liver.

The gall bladder stores bile and releases it into the duodenum when food is present. Some species, such as the horse, do not have a gall bladder.