Radical new Biology theory

The human body is made up of 100000000000 individual cells. Don't start counting the zeroes. Its ok even if I put one or two, too many or too few. The point is it is a very very BIG number. The word individual is debatable as you and I refer to the whole lump as one entity and end up calling it my body or your body. But the fact remains that each and every cell in the body lives for itself as exposed by modern science. It breathes, takes in food ,produces energy and assimilates it. It is in fact leading a complete life (i mean it does all the essential things to keep it alive). The only feature that actually differentiates it from a protozoan single celled organism is that it performs a certain specified function or two (in most cases) AND does not do a few things actively.. (like for example look for food). Another thing is that it takes its orders regarding when to do what from somewhere outside. The brain. But as far as the cell goes it doesn't know the brain exists. I mean even the protozoan knows when to do what from the outside so to say. It also does things only in response to external impulses/stimuli. The cell just knows from experience that if it does whatever it has to do whenever it gets those electrical signals from the outside it can live peacefully and it'll continue to get its supply of air and food through blood.

So I guess the issue is cleared and we can call them individual entities. But the point is why is it that it never disobey these orders from 'outside'. Simple probability should tell us that the a cell is bound to 'think' of the outcome of disobeying an order now and then. Just to see if the effect is rewarding or not. But again by simple numbers we can see that the same instruction would have been sent to a whole bunch of cells surrounding our rebel one and so even if our guy decides not to do something for a change the effect isn't big on the large scale and our cell also learns that it isnt rewarding to abstain from work and would also realise that it is quite boring to sit idle.