What are the biological functions of lipids.

Lipids perform the following biological functions:
1. Structural. In combination, phospholipids with proteins form biological membranes.
2. Energy. In the process of fat oxidation, a large amount of energy is released, and it is this energy that goes into the formation of ATP. Most of the body’s energy reserves are stored in the form of lipids, and is consumed in case of lack of nutrients. So, for example, animals fall into hibernation, and fats and oils previously accumulated go to support vital functions. Due to the high lipid content in plant seeds, a germ and a seedling develop until they feed on their own.
3. Thermal insulation and protective. It is deposited in the subcutaneous tissue and around organs such as the intestines and kidneys. The resulting layer of fat protects the body of the animal and its organs from mechanical damage. Since subcutaneous fat has low thermal conductivity, it perfectly retains heat.
4. Lubricating and water repellent. There is a layer of wax on the skin, coat and feathers that leaves them supple and protects from moisture. Such a layer of wax is on the leaves and fruits of various plants.
5. Regulatory. Sex hormones, testosterone, progesterone and corticosteroids, as well as others are derivatives of cholesterol. Vitamin D, cholesterol derivatives, play an important role in the metabolism of calcium and phosphorus. Bile acids are involved in digestion (emulsification of fats), as well as the absorption of higher carboxylic acids.

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