The human body, simply, is composed of chemical structures that include atoms, ions, and molecules. There are many forms of anatomy that can also be broken down into chemistry based fields. Examples of this include microscopic anatomy, which means looking at structures that cannot be seen with the unaided eye, such as a cell. Another branch of anatomy is gross anatomy which focuses on structures and the relationships of body parts that are visible to the unaided eye. Through the chemistry of anatomy, scientists are able to research how the body functions in correlation of the chemistry that makes up the body function.