Not sure where to ask this question and thought this would the best place. I am not after any opinion or theological, philosophical answers. I am after the science or biology research, experiments or facts. I would like the answer to be focused on the following: Why do we die? With the condition that there are no diseases or any outside factors contributing to death.
In a simpler way, what makes us die biologically, physiologically. Is there a trigger? Is it cellular?.... and so on
As per suggested comment, I have researched genetics such as cell regeneration dynamics, Organ's lives studies. Yet I find very little on the brains involvement, nervous system, chemical or anything else on the multitude of systems we have including triggers or irreversible messages from any or these systems