Give an example of how cells structure relates to its functions in the body

The structure of the cellular components in a cell determines the function of component.

Take the case of an organelle which produces energy in a eukaryotic cell called mitochondria. Mitochondria are structured in a way that it can synthesize a large amount of ATP in a small enclosed area.  

The structure of mitochondria contains outer membrane, inner membrane and the matrix. The membranes are structured that they can hold and accumulate the protons and allow the flow of proton. Similarly, the inner membrane gets folded to increases the output of ATP synthesis by forming infoldings called cristae which embodies ATP synthase.

This shows how the structure and functions are related in a cell.