Myocardial infarction is described as the occlusion of one or more coronary arteries caused by plaque buildup (heart attack).

• A. Myocardial infarction
• B. Endocarditis
• C. Osteoporosis
• D. Paget's disease

Answer: (A)

A myocardial infarction occurs when a coronary artery becomes blocked, usually from a ruptured atherosclerotic plaque that forms a clot and stops blood flow to part of the heart muscle. Without oxygen, that heart tissue is damaged and can die—this is the event people refer to as a heart attack. The statement describes exactly this mechanism: occlusion of one or more coronary arteries caused by plaque buildup, leading to ischemia of the heart muscle. The other options don't fit because they involve different conditions—endocarditis is an infection of the heart’s inner lining or valves, osteoporosis is a bone density disease, and Paget’s disease is a bone remodeling disorder.