How does a cells structure relate to its function in the body?

The shape of a cell dictates the function of that cell. This is more pertinent to animal cells that, unlike plant cells, do not have a rigid cell wall. A misshapen cell cannot properly perform its intended function. 

Their function is to carry electrical signals to and from the body and the brain. Size as well as shape plays a crucial role in cell function. A cell must be big enough to contain all the essentials, which include DNA strands, protein, and survival and reproductive structures. ... Larger cells have a larger surface area.