What is the cause of shivering?

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Shivering

Q. What is the cause of shivering?

A. Shivering occurs when the temperature of the blood has been reduced a few tenths of a degree.

Muscular action is always attended by the production of heat as a by-product. When the temperature of the blood is lowered, shivering, an involuntary action of the muscles, takes place as a defensive effort having for its purpose the production of heat. Shivering is thus a remedial process and may be even encouraged with ad­vantage. An eminent English traveler who ex­plored the Arctic regions, in giving an account of his experiences mentioned that on a certain occasion he and his companions having become greatly chilled by exposure sat down upon a block of ice and shivered themselves warm.

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