Final answer:
Myocardial infarction, also known as a heart attack, occurs when there is a sudden blockage of the coronary arteries, restricting blood flow and oxygen to the heart muscle.
Step-by-step explanation:
Myocardial infarction, also known as a heart attack, occurs when there is a sudden blockage of the coronary arteries, restricting blood flow and oxygen to the heart muscle. This results in the death of cardiac muscle cells. A heart attack can cause symptoms such as chest pain, and if left untreated, it can lead to heart arrhythmias, heart failure, or cardiac arrest.