1. Glycogen storage: When blood glucose levels are high, insulin produced by the islets of Langhans stores the excess glucose as glycogen. About 100 grams of glycogen are stored in the liver. Glycogen is changed back to glucose as needed by the body.
2. Fat storage: All the sugars that are not used in the human body and are not stored as glycogen, the liver cells convert them into fat and store them.
3. Vitamin storage: Liver cells store vitamins A, D, E and K in the human body. It also stores some amount of nicotinic acid (B12) and folic acid.
4. Blood storage: Although the ducts of the liver carry blood, they also act as reservoirs for storing a large amount of blood. The liver stores about 1500 cubic cm of blood.
5. Bile secretion and storage: Liver cells secrete and store bile. The liver secretes 400-800 ml of bile per day.
6. Iron storage: Hemoglobin in blood contains heme and globin. Heme contains iron called ferritin. Liver ferritin stores iron.
7. Mineral salt storage: The liver stores minerals such as zinc, copper, cobalt, molybdenum, ions, potassium etc. in the human body. The liver ion produces new red blood cells in the bone marrow.