Flexi Says: Structure refers to shape or arrangement whereas, function refers to the role. In living organisms, the structures of cell organelles, cells, tissues, organs, and organ systems are such that they suit their respective functions. At the cellular level, for example, a neuron with its dendrites and axon is perfectly designed for the conduction of nerve impulses. An example of perfectly designed organ is the heart which is muscular and can tirelessly beat and pump the blood for the entire lifespan of a vertebrate.
