Definition
The branch of biology that studies how the body and its organs function — how systems such as respiration, circulation, and the nervous system actually work. In aviation, the term most often refers to aviation physiology: how the human body responds to the flight environment, including reduced oxygen at altitude, pressure changes, acceleration forces, vibration, noise, and disorientation.
Plain English
The study of how the body works, and in flying, how the body reacts to being up in the air.
Context Anchor
Seen in pilot health and safety discussions, especially when studying altitude, oxygen, fatigue, vision, motion, and stress in flight.
Derivation
From the Greek physis meaning 'nature' and logia meaning 'study of' — literally 'the study of how nature works.' For pilots, that nature is the human body and how it copes with flight.
Why Pilots Care
Understanding physiology allows pilots to recognize and manage conditions such as reduced oxygen or disorientation before they become dangerous.
Grounding Statement
If a pilot climbs to an altitude where the body gets less oxygen, physiology explains what happens inside the body and why performance can drop.
Intuition Check
Physiology is not the same as anatomy. Anatomy is about body parts; physiology is about how those parts work.
Example Sentence 1
The instructor covered the physiology of high-altitude flight, including how oxygen levels drop as the aircraft climbs.
Example Sentence 2
Proper understanding of physiology helps a pilot detect the first signs of trouble during a high-G maneuver.