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 artery disease. The most common underlying cause of heart attack is atherosclerosis, a condition in which a fatty substance called plaque builds up on the inside walls of blood vessels. When this occurs in the coronary arteries, it's known as coronary artery disease (CAD).
Heart Attack Causes. Most heart attacks are the result of coronary heart disease, a condition that clogs coronary arteries with fatty, calcified plaques. In the early 1980s, researchers confirmed that the immediate cause of nearly all heart attacks is not the obstructive plaque itself.ost heart attacks are the result of coronary heart disease, a condition that clogs coronary arteries with fatty, calcified plaques. In the early 1980s, researchers confirmed that the immediate cause of nearly all heart attacks is not the obstructive plaque itself.