Anatomy and Physiology (A&P) are usually grouped togather.

Anatomy is the branch of biology concerned with the study of the structure of organisms and their parts. Anatomy is a branch of natural science which deals with the structural organization of living things. It is an old science, having its beginnings in prehistoric times.

Physiology is the scientific study of the mechanisms and functions which work within a living system. As a sub-discipline of biology, the focus of physiology is on how cells, organisms, organs, organ systems, and biomolecules carry out the physical and chemical functions that exist in a living system.