What do both chylomicrons and very-low-density lipoproteins (VLDLs) transport in the bloodstream?

Chylomicrons and very-low-density lipoproteins (VLDLs) are both types of lipoproteins that play a critical role in lipid transport within the bloodstream. The primary function of these lipoproteins is to carry triglycerides, which are a type of fat, from one part of the body to another.

Chylomicrons are formed in the intestines after a meal that contains fat; they transport dietary triglycerides from the intestines through the lymphatic system and into the bloodstream for delivery to various tissues. VLDLs, on the other hand, are produced by the liver and serve to transport endogenous triglycerides—those made by the body—from the liver to peripheral tissues.

The ability of both chylomicrons and VLDLs to carry triglycerides is essential for energy metabolism and storage, making this transport mechanism vital for maintaining energy balance in the body. Understanding this function emphasizes the importance of fats in nutrition and metabolism, particularly for energy provision.