What is the primary role of LDL in the body?

• A. Carries oxygen
• B. Transports cholesterol to all cells of the human body to produce cell membranes
• C. Removes cholesterol from blood and transports it to the liver
• D. Helps digest fats

Answer: (C)

Cholesterol transport by lipoproteins is the key idea. LDL’s main job is to deliver cholesterol to cells throughout the body that need it for making cell membranes and for other vital processes. Cells take up LDL via LDL receptors and use the cholesterol as a building block.

The choice describing removing cholesterol from the blood and taking it to the liver matches HDL’s function, not LDL. HDL participates in reverse cholesterol transport, gathering cholesterol from tissues and bringing it back to the liver for disposal or reuse.

So LDL’s role is delivery to cells that need cholesterol, while HDL’s role is removal from circulation to the liver. High LDL levels can be linked to plaque buildup in arteries, which is why the balance between LDL and HDL is important.