Section 13
Stress
Book
Version 29
By Boundless
By Boundless
Boundless Anatomy and Physiology
Physiology
by Boundless
5 concepts
![Thumbnail](../../../../../../figures.boundless-cdn.com/30923/square/basic-hpa-axis.jpeg)
The Stress Response
The body's stress response is mediated by the sympathetic nervous system and the hypothalmic-pituitary-adrenal (HPA) axis.
The Fight-or-Flight Response
The fight-or-flight response is regulated by the release of adrenaline or noradrenaline.
![Thumbnail](../../../../../../figures.boundless-cdn.com/6614/square/b7-c6f9-4293-8d70-56c00ae072cb.jpeg)
The Resistance Reaction
Resistance is the second stage of the general adaptation syndrome, where the body has an increased capacity to respond to the stressor.
![Thumbnail](../../../../../../figures.boundless-cdn.com/1899/square/eneral-adaptation-syndrome.jpeg)
Exhaustion
Exhaustion is the depletion and inability to maintain normal function and often results in physical illness.
![Thumbnail](../../../../../../figures.boundless-cdn.com/31404/square/ptsd-stress-brain.gif)
Stress and Disease
Over-activation of the stress response can result in pathology and disease.