I will do the best I can. I am sorry for your loss. Acute MI is a heart attack
. Sometimes the heart muscle is so damaged that it can not beat any longer. Circulatory collapse is because with out the heart beating there is not a way to carry the oxygen
/ blood throughout the body. I am sorry that it was not presented in a way you could understand it. Death happens quickly. Again, I am sorry for your loss. Take care of yourself and know that your Mom loved you and she knew you loved her also.