Phospholipid has two tails of the fatty acids and the head, consisting of a phosphoric acid residue. Another type of fat - ceramides. They are also part of the cell membranes and in addition, serve as signal carriers.
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The head consists of ceramide alcohol sphingosine, and only the tail - from a fatty acid. Fatty acids - a versatile material for creating fat. In a completely different fats belonging to different organisms and different functions, it is possible to find the same fatty acid. This versatility allows the body to save a lot of energy: instead of each time to synthesize fatty acids of the basic elements, you can simply use ready-made molecules split from triglycerides of edible oils and fats. Some fatty acids our bodies even forgotten how to synthesize, so used to getting their food. These acids are called essential. These include linoleic, linolenic and arachidonic acid (strictly speaking, the arachidonic acid from the list should be excluded, as it may be synthesized from linoleic acid). on food labels are increasingly view showing a detailed structure of different types of fat: Saturated monounsaturated, polyunsaturated, hydrogenated.