Final answer:
Myocardial infarction, also known as a heart attack, occurs when there is a complete blockage of the coronary arteries, resulting in damage to the myocardial tissue.
Step-by-step explanation:
The condition commonly known as a heart attack and results in damage to the myocardial tissue is called myocardial infarction (MI). It occurs when there is a complete blockage of the coronary arteries, leading to the death of cardiac muscle tissue. This blockage is usually caused by the buildup of atherosclerotic plaque in the arteries.