Definition
Relating to the normal functioning of a living body and its systems — including the brain, heart, lungs, muscles, and senses — and how those systems respond to conditions such as stress, altitude, fatigue, or sudden events.
Plain English
Having to do with how the body works and reacts. A physiological response is something the body does automatically, like a faster heartbeat, quicker breathing, or a sudden tightening of muscles when startled.
Context Anchor
In the Airplane Flying Handbook, this word appears when describing how surprise and startle can affect a pilot's body during flight.
Derivation
From the Greek 'physis' meaning 'nature' and 'logos' meaning 'study of'. Originally meant the study of how living things naturally function. In aviation it refers to those natural body reactions — the ones a pilot cannot consciously switch off.
Why Pilots Care
Unmanaged physiological responses can lead to reduced situational awareness and errors in handling the aircraft.
Grounding Statement
When a loud warning horn sounds unexpectedly, the quick jump in heart rate and muscle tension is a physiological response.
Intuition Check
Physiological does not simply mean “emotional” or “mental.” It means the body's physical response, even when that response is triggered by fear, surprise, or stress.
Example Sentence 1
The sudden bird strike triggered a physiological response — the pilot's heart rate spiked and breathing quickened before conscious thought caught up.
Example Sentence 2
Training helps pilots recognize physiological changes during startle so they can return to controlled flight more quickly.