What would happen to the body if one of the organ systems stopped working?

Other parts of the body can damage

It really depends on which part of the body or which organ is not working. If it was for example the heart basically what it means is death. If it is something like reproductive organs it wont harm you instead it just means you wont be able to reproduce.

Cell membranes

Explanation:

Cell membranes act as barriers to most, but not all, molecules. Development of a cell membrane that could allow some materials to pass while constraining the movement of other molecules was a major step in the evolution of the cell. Cell membranes are differentially (or semi-) permeable barriers separating the inner cellular environment from the outer cellular (or external) environment.