What are the differences in structure between LDL and HDL particles?

LDL (low-density lipoprotein) and HDL (high-density lipoprotein) particles differ in their composition and function. LDL particles are larger and contain more cholesterol, while HDL particles are smaller and contain more protein. LDL particles transport cholesterol from the liver to cells, while HDL particles remove excess cholesterol from cells and transport it back to the liver for disposal.