Final answer:
Myocardial infarction is a result of insufficient oxygen-rich blood supply to the heart muscle, typically due to a blockage in the coronary arteries.
Step-by-step explanation:
Myocardial infarction, commonly known as a heart attack, is a result of insufficient blood and oxygen supply to the heart. Normally, the coronary circulation sustains the heart with oxygen-rich blood through the coronary arteries while coronary veins carry deoxygenated blood away from the heart muscle cells. When a coronary artery is blocked, often due to the buildup of atherosclerotic plaque, this leads to an ischemic condition where the affected area of the heart does not receive enough blood and subsequently, oxygen. If this blockage is not quickly resolved, it results in the death of cardiac muscle cells, or myocardial infarction. In summary, myocardial infarction is a result of insufficient blood supply, which contains the critical oxygen that cardiac muscle cells need to survive.