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.
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.