(a) Describe the mechanism of breathing in human beings. (b) (i) Under normal conditions, what is the rate of breathing per minute? (ii) Why does the rate of breathing increase by 20 to 25 times during vigorous exercise?
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the breathing rate is 15-18times per minute .the rapid breathing supplies more O2 during physical exercise to provide more energy
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The rate of breathing increases during vigorous exercise. This is because the body needs more energy which can be released only if greater amounts of oxygen reach the cells. For this purpose, the rate of breathing increases. ( This will increase the supply of oxygen to the cells).
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