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 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.eart Attack Causes. Most heart attacks are the result of coronary heart disease, a condition that clogs coronary arteries with fatty, calcified plaques.