Cholesterol Screening Your body needs cholesterol to make hormones and to keep your cells healthy. Cholesterol comes from two sources: your liver and your diet. However, if your diet exceeds the body’s need for cholesterol or saturated fats, your cholesterol level in your blood will increase. This video discusses treatments and lifestyle changes that may be prescribed by your doctor. CPR and Defibrillator Quiz Sudden cardiac death is the leading cause of death in adults in the United States. Knowing CPR may help you save someone's life. Learn more about CPR by taking this quiz. Heart Health Quiz Heart-attack deaths have fallen 60 percent in four decades. Still, millions of Americans suffer from cardiovascular diseases linked with heart attacks and strokes. Cardiac Catheterization Cardiac catheterization procedure can diagnose a variety of heart conditions and determine the health of your coronary arteries, heart valves, and heart muscle. View this video to learn what happens during this procedure and various treatment options.