Heart tissue damaged due to partial or complete blockage of one or more coronary arteries is a

The situation described involves heart tissue that has become damaged due to the blockage of coronary arteries, which supply blood to the heart muscle. A heart attack, also known as a myocardial infarction, occurs when one or more of these arteries are blocked, leading to a reduction in blood flow. This blockage can be caused by a buildup of plaque, which can rupture and form a clot that entirely obstructs blood flow. As a result, the affected area of heart muscle begins to die due to lack of oxygen, resulting in a heart attack.

In contrast, a stroke refers to a disruption of blood supply to the brain, while a pulmonary embolism specifically involves an obstruction in the pulmonary arteries, usually due to a blood clot that travels to the lungs. Arrhythmia refers to irregular heartbeats, which can occur for a variety of reasons but is not directly associated with the damage caused by a blockage in the coronary arteries. Therefore, the most accurate answer in this context is indeed a heart attack.