What role does high blood cholesterol play in cardiovascular health?

High blood cholesterol is recognized as a major risk factor for heart disease because elevated levels can lead to the buildup of plaque in the arteries, a condition known as atherosclerosis. This buildup narrows the arteries, reducing blood flow and increasing the likelihood of heart attacks and strokes. High cholesterol levels in the blood can result from various factors, including diet, genetics, and lifestyle choices, which means that monitoring and managing cholesterol is vital for cardiovascular health.

The incorrect options point to misunderstandings about cholesterol's effects on the body. For instance, the idea that high blood cholesterol reduces heart disease risk is misleading, as it actually increases the risk. Saying it is always harmless fails to recognize the potential dangers associated with high cholesterol levels, while claiming it improves circulation doesn't accurately reflect the consequences of high cholesterol, which tends to obstruct blood flow rather than facilitate it.