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Why is positive feedback helpful in blood clotting but unsuitable for the regulation of body temperature?

User Hsan
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The human body has two type of feedback mechanism, positive and negative feedback. Positive feedback is a cyclic process that amplifies the action of a system until a negative feedback response is obtained. Positive feed back is important in processes that must go to completion quickly, for instance blood clotting. But it is harmful in situations in which stable conditions must be maintained, for instance body temperature,  this is because it encourages departure from the state of stability. 
User Skyebend
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