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.
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.