If structure (anatomy) is the “what”, then function (physiology) is the “how”. In other words, anatomy is the study of the body structures and physiology is the study of how they function. However, these two concepts are not exclusive. It is important to understand a fundamental principle of anatomy and physiology: form dictates function.

Whereas anatomy is about structure, physiology is about function. Human physiology is the scientific study of the chemistry and physics of the structures of the body and the ways in which they work together to support the functions of life. Much of the study of physiology centers on the body’s tendency toward homeostasis.

The study of the human body includes anatomy, physiology, histology and embryology. The body varies anatomically in known ways. Physiology focuses on the systems and organs of the human body and their functions.