Q4 of 38 Page 45

Why does the rate of breathing increase while walking uphill at a normal pace in the mountains? Give two reasons. (AS1)

The rate of breathing increases while climbing uphill because:

I. The atmosphere is very thin at high altitudes, the amount of oxygen in the atmospheric air is low.


II. Our body needs more oxygen while climbing up hill as hemoglobin does carry sufficient oxygen to the cell for cellular respiration. So, to increase the amount of oxygen, the rate of breathing increases.


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