The death of part of the heart muscle is commonly known as what
user: the death of part of the heart muscle is commonly known as a cardiac arrest/stroke/heart attack.
user: what is cardiac arrest

The death of part of the heart muscle is commonly known as a Heart Attack it usually occurs with symptoms, and happens when an artery is blocked.  I person may suffer symptoms such as chest pain along with others.  Cardiac arrest is the medical term referring to an electrical change that affects the way the heart beats, or may stop the heart from beating and occurs suddenly.  A stoke involves damage to the brain, and may be caused by Cardiac arrest.

What happens to the influenza virus every 20-40 years and why?