Final answer:
High-density lipoproteins (HDL) are called 'good cholesterol' as they collect cholesterol from tissues and return it to the liver, reducing the risk of heart disease. Low-density lipoproteins (LDL), known as 'bad cholesterol,' carry cholesterol from the liver to tissues and high levels can lead to artery plaque buildup.
Step-by-step explanation:
High-density lipoproteins (HDL) are lipoproteins that collect cholesterol from other tissues and return it to the liver. HDL is often referred to as 'good cholesterol' because it helps remove excess cholesterol from the bloodstream, reducing the risk of heart disease. On the other hand, low-density lipoproteins (LDL) carry cholesterol from the liver to other tissues and are sometimes called 'bad cholesterol' as high levels of LDL can lead to the buildup of plaque in the arteries, increasing the risk of heart disease.