Outline of physiology

The following outline is provided as an overview of and topical guide to physiology:
Physiology – scientific study of the normal function in living systems. A branch of biology, its focus is in how organisms, organ systems, organs, cells, and biomolecules carry out the chemical or physical functions that exist in a living system.
What "type" of thing is physiology?
Physiology can be described as all of the following:
Branches of physiology.
By approach
By organism
By process
By subsystem
History of physiology.
History of physiology