Multiple choice

Heart attack occurs due to

  1. Bacterial attack on the heart

  2. Stopping of heart beat

  3. Lack of blood supply to the heart itself

  4. Impairment of heart's working due to unknown reasons

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A heart attack (myocardial infarction) occurs when blood flow to the heart muscle is blocked, usually by a blood clot in a coronary artery. This lack of blood supply causes heart muscle cells to die. It's not caused by bacteria, and the heart doesn't completely stop beating (that's cardiac arrest).