Biology / Unit 1 Bio 0051 short lesson, about 20 seconds
Homeostasis
Captions available
The idea
Homeostasis is the maintenance of a relatively stable internal environment despite changes in the world outside an organism.
In practice
A polar bear generates heat and traps it under fur and fat, holding its internal temperature steady in freezing air.
Where people slip
Homeostasis holds conditions within a narrow working range; it does not hold them perfectly constant.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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