Lipids

Lipids are a class of organic compounds that are fatty acids. These lipids are used for energy storage, membrane structure and signaling between organ systems. Lipids are also significantly nonpolar and most are mainly composed of hydrogren and carbon and able to form van der Waals interactions. Triacylglycerols are three fatty acids attached to a glycerol and are formed by dehydration reactions between glycerol hydroxyl groups and fatty acid carboxyl groups. Triacylglycerol are often found in the liver and adipocytes and are main tissues involved in fat metabolism. Material from the digestive system directly enters the liver and biosynthesis of lipoproteins occurs which is then distributed to body cells for energy use.