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).
The most common form of heart disease is coronary artery disease, which can lead to heart attack, according to the CDC. Heart attack occurs when the heart muscleâs blood supply is cut off by a blood clot in one or more pulmonary veins or arteries.