The difference between heart attack and cardiac arrest. Both this one sounds very similar because both of them can suddenly end your life. So what is heart attack and what is cardiac arrest? To understand thatI think you should first understand the basic physiology of the heart. So heart is a pump, it starts pumping from the day you are born to the day you die. So to make sure the heart pumps efficiently and continuously there are two circuits which help your heart. One circuit is a tube or the blood vessel which is ca...