Anatomy and physiology are two of the most basic terms and areas of study in the life sciences. Anatomy refers to the internal and external structures of the body and their physical relationships, whereas Physiology refers to the study of the functions of those structures.
Source: Blanchard, S. (2005). Anatomy and physiology. In J. D. Enderle & J. D. Bronzino (Eds.), Introduction to biomedical engineering (Second Edition, pp. 73–125). Academic Press. https://www.sciencedirect.com/science/article/pii/B9780122386626500057