On average, an adult human being at rest breathes 15- 18 times per minute. The breathing rate, however, may differ under different conditions. Arrange the following activities given in the box in order of increasing breathing rates and give the reason for your answer
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Sleeping > Watching > T.V. > Brisk Walk > Cycling
The breathing rate becomes faster when we are working. The more is the strenuous work, the more is the breathing rate, and so, that sufficient oxygen can reach to the cells.
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