Functions of lipids steroids in animals

Sterol lipids, such as cholesterol and its derivatives, are an important component of membrane lipids, [32] along with the glycerophospholipids and sphingomyelins. The steroids , all derived from the same fused four-ring core structure, have different biological roles as hormones and signaling molecules . The eighteen-carbon (C18) steroids include the estrogen family whereas the C19 steroids comprise the androgens such as testosterone and androsterone . The C21 subclass includes the progestogens as well as the glucocorticoids and mineralocorticoids . [33] The secosteroids , comprising various forms of vitamin D , are characterized by cleavage of the B ring of the core structure. [34] Other examples of sterols are the bile acids and their conjugates, [35] which in mammals are oxidized derivatives of cholesterol and are synthesized in the liver. The plant equivalents are the phytosterols , such as β-sitosterol , stigmasterol , and brassicasterol ; the latter compound is also used as a biomarker for algal growth. [36] The predominant sterol in fungal cell membranes is ergosterol . [37]

Lipids that contain a functional group ester are hydrolysable in water. These include neutral fats, waxes, phospholipids, and glycolipids.
Nonhydrolyzable lipids lack such functional groups and include steroids and fat-soluble vitamins (. A, D, E, and K). Fats and oils are composed of triacylglycerols or triglycerides. These are composed of glycerol (1,2,3-trihydroxypropane) and 3 fatty acids to form a triester. Triglycerides are found in blood tests. Complete hydrolysis of triacylglycerols yields three fatty acids and a glycerol molecule. 

Functions of lipids steroids in animals

functions of lipids steroids in animals

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functions of lipids steroids in animalsfunctions of lipids steroids in animalsfunctions of lipids steroids in animalsfunctions of lipids steroids in animalsfunctions of lipids steroids in animals

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