In which of the following areas does physiology focus?

Physiology is primarily concerned with the functions of living organisms. It examines how various systems and processes operate within an organism, including mechanisms at the cellular, organ, and whole-organism levels. This branch of biology explores aspects such as how organs interact, how systems respond to changes, and how metabolic processes sustain life.

This focus on function distinguishes physiology from other biological sciences; for instance, the study of cells usually falls under cell biology, while the structure of living organisms pertains more to anatomy. Environmental interactions, meanwhile, are studied in fields like ecology. In essence, physiology is central to understanding how life processes work, making it a vital area within the life sciences.