The document summarizes information about the heart, vascular system, cardiovascular risk factors, forms of cardiovascular disease, and prevention and treatment of hypertension. It describes that the heart has four chambers and is located in the thorax between the lungs. The vascular system includes arteries that carry blood away from the heart and veins that return blood to the heart. Risk factors for cardiovascular disease include age, gender, heredity, smoking, physical inactivity, high blood cholesterol, high blood pressure, diabetes, and obesity. Forms of cardiovascular disease include coronary artery disease, hypertension, stroke, and congestive heart failure. Prevention and treatment of hypertension includes weight reduction, physical activity, moderating alcohol, sodium restriction, and stress reduction.