Pre-Algebra on Khan Academy: No way, this isn't your run of the mill arithmetic. This is Pre-algebra. You're about to play with the professionals. Think of pre-algebra as a runway.
Coronary heart disease. Coronary heart disease (CHD) is the leading cause of heart attacks. CHD is a condition in which the coronary arteries (the major blood vessels that supply the heart with blood) get clogged up with deposits of cholesterol. These deposits are called plaques.
1 Atherosclerosis is also the most common cause of heart disease and heart attack. 2  High blood pressure: High blood pressure puts stress on the wall of the aorta. 3  Over many years, this stress can lead to bulging of the blood vessel wall. 4  This is the leading factor in development of aneurysms of the thoracic aorta.