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===Homeostasis in the human body===
All sorts of factors affect the suitability of the [[human]] body fluids to sustain life; these include properties like [[temperature]], [[salinity]], [[acidity]] ([[carbon dioxide]]), and the concentrations of nutrients and wastes ([[urea]], [[glucose]], various [[ion]], [[oxygen]]). Since these properties affect the chemical reactions that keep bodies alive, there are built-in physiological mechanisms to maintain them at desirable levels.
===Examples===
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