Lipoproteins are “tiny droplets with a core of cholesterol and triglycerides and a coating of proteins and phospholipids. This coating not only enables the lipids to remain suspended in the blood but also serves as a recognition marker for cells that absorb the,” (Saladin,2015,p.1001). There are four main types of lipoproteins: these four types are: chlyomicrons, high density lipoproteins or (HDLs), low density lipoproteins or (LDLs), and very low density lipoproteins or (VLDLs). (Saladin,2015,p.1001). These are based on the proportion of proteins to lipids, the higher the proportion o protein to lipid, the higher the density. They are also very different in size. chlymoomicrons range from 75 to 1200nm in their diameter while the others get smaller and smaller. High density lipoproteins range from 5 to 12 nm in diameter, low density lipoproteins range from 18 to 25nm in diameter, and very low density lipoproteins range from 30 to 80nm in diameter. (Saladin,2015,p.1001). The most important differences involve their make up and functions. Chlymoomicrons are formed in the small intestine and thEn move into the lymphatic system before finally making their way into the bloodstream.. These are hydrolysis into free fatty acids that can eventually be resynthesized into storage triglycerides. (Saladin,2015,p.1001). Very low density lipoproteins are produced by the liver and transport lipids to adipose tissue for storage. (Saladin,2015,p.1001). High density lipoproteins start out in the liver, where an empty shell is formed. this shell travels through the blood gathering cholesterol and phospholipids form different organs. High density lipoproteins are a vehicle that removes excess cholesterol from our bodies. (Saladin 2015, p.1001). Low density lipoproteins are created when the triglycerides are removed from the adipose tissue in very low density lipoproteins. Low density lipoproteins contain mostly cholesterol and are important for cells that need cholesterol for either membrane structure or steroid hormone synthesis. These cells absorb LDLs, digest them and release their cholesterol for use within the cell. (Saladin,2015,p.1001).
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