AP BIOLOGY

Detailed explanation-1: -Myocardial infarction (MI): It occurs when an area of the heart muscle (myocardium) is damaged or dies after blood supply is blocked. It’s the classic medical term for a heart attack.

Detailed explanation-2: -If the blood and oxygen supply is cut off, muscle cells of the heart begin to suffer damage and start to die. Irreversible damage begins within 30 minutes of blockage. The result is heart muscle affected by the lack of oxygen no longer works as it should.

Detailed explanation-3: -During a heart attack, a lack of blood flow causes the tissue in the heart muscle to die. A heart attack occurs when the flow of blood to the heart is severely reduced or blocked. The blockage is usually due to a buildup of fat, cholesterol and other substances in the heart (coronary) arteries.

Detailed explanation-4: -Cell Death in myocardial infarction In this section, we focus on cardiac myocyte death in the ischemic zone. During myocardial infarction, cardiac myocytes in the ischemic zone die by both apoptosis and necrosis.

Detailed explanation-5: -If too much muscle dies, the heart is not able to pump enough blood to the rest of the body. Damage to the heart cells that regulate the heartbeat may cause fatal heart rhythm problems. Sometimes, the heart muscle weakens and can tear as a result of the damage. This causes a fatal hemorrhage (bleeding).