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).
Difference between heart attack and heartburn causes Just as the symptoms differ, the causes of heart attacks also vary from the causes of heartburn. Heart attacks are commonly caused by coronary heart diseaseâwhere arteries become clogged with cholesterol and prevent blood from flowing into the heartâas well as blood clots, hypoxia due to carbon monoxide poisoning, and the abuse of drugs.