Fight-or-flight response
When an animal feels threatened, epinephrine and norepinephrine released by the adrenal medulla prepare the body to fight a threat or flee from it by breaking down stores of glycogen, which provides an immediate boost of energy.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Gato enervado pola presencia dun can."
http://en.wikipedia.org/wiki/File:Gato_enervado_pola_presencia_dun_can.jpg
Wikipedia
CC BY.
