How do chylomicrons differ from VLDL?

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Hi, everybody. And welcome back. Our next question says, which of the following best describes how LDL differs from VLDL. A LDL is responsible for fat digestion. While VLDL is not BLDL is synthesized in the liver. While VLDL is synthesized in the intestines, CLDL removes cholesterol from the bloodstream. While VLDL adds cholesterol to the bloodstream. Or DLDL primarily carries cholesterol. Well, VLDL primarily carries triglycerides. Well, the easiest difference between them is by their names. LDL standing for low density lipo lipoprotein while the LDL is very low density lipoprotein, but that doesn't help us with our answers. We're not given that as an easy choice. So let's think this through first, it can help to think of the four different types of lipoproteins. These are structures made up of lipids and proteins that transport lipids in the aqueous environment of the body and they have a difference of density based on their protein versus lipid composition. So remember that lipids are less dense than proteins. So we can see that in this respect, a very low density lipoprotein has more lipid content than a low density lipoprotein. But again, that's not given to us as a choice to distinguish them. So we need to think about the roles they have. So in order of density from lowest to highest, we have Chylomicron being lower in density than our very low density lipoproteins are VLDLS lower than LDLs, which are lower than HDL, high density lipoprotein. So let's think about what our middle two here do. The LDL and LDL are very low density lipoproteins. What they transport are triglycerides. So transport triglycerides while LDL usually fairly easy to remember transports cholesterol. And we can remember this because if you have gone for a health checkup, you know, had a blood test. LDL is often known as bad cholesterol. When they check your LDL and HDL, they're checking your cholesterol levels. It's not that LDL is cholesterol. It's that LDL transports cholesterol as does HDL. And where does it transport these things? Well, VLDL transports triglycerides from the liver to uh for either storage and adipose tissue or to be used for energy in other tissues. And then we recall LDL and HDL, both transport cholesterol. LDL being known as bad cholesterol because it transports cholesterol from the liver to the bloodstream. And that is an issue because if there is excess cholesterol in the bloodstream, it can be deposited on the walls of the arteries leading to, you know, the potential of heart disease. So having remembered these things, let's evaluate our answer choices. The choice says LDL is responsible for fat digestion while the LDL is not, well, we're going to cross that off because neither is involved in fat digestion. It is Chylomicron that transport fat from the intestines after digestion and not just fat, they transport all types of lipids from the intestines to the liver or various tissues. So A is not correct choice. B says LDL is synthesized in the liver while VLDL is synthesized in the intestines and this is incorrect. VLDL is synthesized in the liver and is converted to LDL in the bloodstream. So we can cross out choice B to AC LDL removes cholesterol from the bloodstream while the LDL adds cholesterol to the bloodstream incorrect because it is HDL that removes cholesterol from the bloodstream. And LDL that adds cholesterol to the bloodstream. So just by elimination, we have choice D as our answer. And indeed, that is correct that LDL primarily carries cholesterol. While VDLVLDL primarily carries triglycerides, hope to see you in the next video.

How do chylomicrons differ from VLDL?

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Key Concepts

Chylomicrons

VLDL (Very Low-Density Lipoprotein)

Lipoprotein Function and Composition