Just to be a pain, but not all heart shots will cause the heart to stop beating.
Deer shot through the heart/lungs and big arteries
usually go down so quickly because they have a massive drop in blood pressure. This is why deer shot through the femoral artery, dorsal aorta and renal arteriescan go down as fast as double lunged deer. Lack of blood flow/oxygen to the brain is what kills the deer. Lack of blood pressure is what causes deer to black out within seconds.
This is your physiology lesson for the day. [&:]