Mayo Clinic
Mayo Clinic: Cholesterol Levels
This effective site describes the different types of cholesterol, provides information on the optimal levels of cholesterol and triglycerides, and suggests lifestyle changes for improving cholesterol readings.
CK-12 Foundation
Ck 12: Life Science: Cardiovascular System Health
[Free Registration/Login may be required to access all resource tools.] There are many risk factors that can cause a person to develop cardiovascular disease. A risk factor is anything that is linked to an increased chance of developing...
University of Utah
University of Utah: Learn. Genetics: Good and Bad Cholesterol
Explains the difference between high density and low density cholesterol, and how their levels affects one's risk of heart disease.