Rabbi Dr. Avraham Steinberg
The Beating Heart Just an Organ
[1 minute 2 seconds]
Physiologically, the heart has its own pacemaker and if it is surrounded by appropriate nutrition and ways to get rid of poisonous material, it can function without a body. I think every student of biology or medicine knows and probably did an experiment on a frog where one takes out the heart of a frog from the body of a frog and puts it in saline, and sees that it continues to beat although it is not connected to any parts of the body because it has an inner pacemaker that functions on its own. So that the fact that the heart is beating does not necessarily mean that the whole individual is still alive.