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HOMEOSTASIS: the maintenance of a stable internal environment.
This is achieved by maintaining stable conditions within the blood ­ which gives rise to the tissue fluid that bathes the body cells:

In the blood the concentration of glucose, ions and carbon dioxide must be kept within narrow limits.
The water…

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SWEATING: sweat released on the skin via sweat ducts evaporate, taking heat energy from the skin. Sweat glands are stimulated by impulses
from the hypothalamus.

HAIRS: these are raised in cold weather by contractions of the erector muscles ­ this is a reflex. The aim is to trap a layer…

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