So remember, that a heart attack, also known as a myocardial infraction is basically the condition by which we have a partial blockage of the blood flow to the heart of our body. For instance, previously we discussed that if we block if we create some type of embolism inside the coronary artery of our heart, that will lead to a heart attack. Now, if there's a partial blockage of blood flow to the heart, that will cause damage inside the cardiac muscle of the heart. And if the cardiac muscle cell is damaged, it will begin releasing its internal components, and that includes releasing the H four LDH molecule. Now, as the cardiac muscle is damaged, releasing the H four LDH into the blood will increase the relative concentration of this molecule inside of the blood. And this molecule is typically not found in a specific high concentration inside our blood.