What is the primary focus of physiology?

The primary focus of physiology is on the function of living organisms. This branch of biology examines how various systems, organs, cells, and biomolecules work together to sustain life. It delves into how these components interact within the context of different conditions, how they respond to external stimuli, and how they maintain homeostasis — the body's internal balance.

Understanding physiology is essential because it provides insight into how normal biological processes operate, which is foundational for identifying what constitutes disease or dysfunction. While aspects such as structure, classification, or disease effects are significant in their own rights, they serve more as supporting facets to the core principles of physiology, which unequivocally centers on the functioning of the organism.