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.
Heart attack - Causes. Heart attacks are caused by the blood supply to the heart being suddenly interrupted. Without this supply, heart muscles may be damaged and begin to die. Without treatment, the heart muscles will experience irreversible damage.
Heart-related causes. Examples of heart-related causes of chest pain include: 1  Heart attack. 2  A heart attack is a result of a blood clot that's blocking blood flow to your heart muscle. 3  Angina. 4  Thick plaques can gradually build up on the inner walls of the arteries that carry blood to your heart.