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.
A heart attack may cause a low pulse and high blood pressure. A heart attack is characterized by insufficient oxygen getting to the heart due to blocked blood vessels.Also known as a myocardial infarction, the heart muscle can either become damaged as a result or the heart muscle can die. heart attack may cause a low pulse and high blood pressure. A heart attack is characterized by insufficient oxygen getting to the heart due to blocked blood vessels.