HOMEOSTASIS

Cells require a constant chemical and physical environment in order to carry out their functions. Therefore, organisms must be able to control their internal conditions. The maintenance of a constant internal environment is known as homeostasis. Homeostasis is the process that keeps body temperature constant and ensures that the composition of the body fluids is kept within narrow limits. By ensuring a relatively stable internal environment, homeostasis allows an organism to be independent from changes in the external environment. The external environment is the environment in which an organism lives. The internal environment refers to conditions within the body of the organism. In mammals, this include the blood an tissue fluid. Changes in the blood will affect the tissue fluid, which in turn will affect the cells of the body.

Example, "Shivering", a reflex contraction of your body muscles, occurs when your body temperature begins to fall. This spasmodic contraction of the muscles increases heat production and helps to raise your body temperature to normal.


sources:
BIOLOGY matters, wikipedia.

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