Quotation from: General ScienceWritten by: Bertha M. Clark |
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There is another very important reason why nose breathing is preferable to mouth breathing. The temperature of the human body is approximately 98 deg. F., and the air which enters the lungs should not be far below this temperature. If air reaches the lungs through the nose, its journey is relatively long and slow, and there is opportunity for it to be warmed before it reaches the lungs. If, on the other hand, air passes to the lungs by way of the mouth, the warming process is brief and insufficient, and the lungs suffer in consequence. Naturally, the gravest danger is in winter.
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