Question: What has become a distinct subdiscipline?
About the article "Physiology", section "History".

Candidate passages:
As the name implies, evolutionary physiology is the product of what was at one time two distinct scientific disciplines.
According to Garland and Carter, evolutionary physiology arose in the late 1970s, following "heated" debates concerning the metabolic and thermoregulatory status of dinosaurs (see physiology of dinosaurs) and mammal-like reptiles.
This period was followed by attempts in the early 1980s to integrate quantitative genetics into evolutionary biology, which had spill-over effects on other fields, such as behavioral ecology and ecophysiology.
In the mid- to late-1980s, phylogenetic comparative methods started to become popular in many fields, including physiological ecology and comparative physiology.
A 1987 volume titled "New Directions in Ecological Physiology" had little ecology but a considerable emphasis on evolutionary topics.
It generated vigorous debate, and within a few years the National Science Foundation had developed a panel titled Ecological and Evolutionary Physiology.
Shortly thereafter, selection experiments and experimental evolution became increasingly common in evolutionary physiology.
Most recently, macrophysiology has emerged as a subdiscipline, in which practitioners attempt to identify large-scale patterns in physiological traits (e.g., patterns of covariation with latitude) and their ecological implications. 
Agricultural geography is a subdiscipline of human geography. 
Computational epistemology is a subdiscipline of formal epistemology that studies the intrinsic complexity of inductive problems for ideal and computationally bounded agents.
In short, computational epistemology is to induction what recursion theory is to deduction. 
The study of human physiology dates back to at least 420  BC to the time of Hippocrates, also known as the father of medicine.
The critical thinking of Aristotle and his emphasis on the relationship between structure and function marked the beginning of physiology in Ancient Greece, while Claudius Galenus (c. 126–199 AD), known as Galen, was the first to use experiments to probe the functions of the body.
Galen was the founder of experimental physiology.
Jean Fernel, a French physician, introduced the term "physiology" in 1525.
In the 19th century, physiological knowledge began to accumulate at a rapid rate, in particular with the 1838 appearance of the Cell theory of Matthias Schleiden and Theodor Schwann.
It radically stated that organisms are made up of units called cells.
Claude Bernard's (1813–1878) further discoveries ultimately led to his concept of "milieu interieur" (internal environment), which would later be taken up and championed as "homeostasis" by American physiologist Walter Cannon.
In the 20th century, biologists also became interested in how organisms other than human beings function, eventually spawning the fields of comparative physiology and ecophysiology.
Major figures in these fields include Knut Schmidt-Nielsen and George Bartholomew.
Most recently, evolutionary physiology has become a distinct subdiscipline.
Fluid mechanics is a subdiscipline of continuum mechanics, as illustrated in the following table.
In a mechanical view, a fluid is a substance that does not support shear stress; that is why a fluid at rest has the shape of its containing vessel.
A fluid at rest has no shear stress.