We all know that the heart is the key to all of our bodily functions.
When we are alive, our heart pumps blood to all around our body, and this causes our nerves to be ''alive'' and our nerves are all around our body, from our head to our feet. Our nerves makes us feel ''alive'' because we can sense, touch, smell, hear and see. and from these senses, we get to experience certain things, which invoke our feelings, hence makes us ''alive''. But when we die, our heart stops, and hence blood stops running thru our body, which causes everything else to stop; its like a chain reaction. We wont have our senses anymore, no more feelings etc, and we cant think, because everything just stops in the body. So we become just a body, with skin and bones, and we arent ''alive''.