LDL receptors are proteins found on the surface of cells that play a crucial role in regulating cholesterol levels in the body. They bind to low-density lipoprotein (LDL), which carries cholesterol through the bloodstream. Once bound, the receptors facilitate the uptake of LDL particles into the cells, helping to maintain healthy cholesterol levels. When LDL receptors are functioning properly, they help prevent the buildup of excess cholesterol in the bloodstream, which can lead to cardiovascular diseases. A deficiency or malfunction of these receptors can result in high cholesterol levels, increasing the risk of heart-related issues and other health problems.