Question

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why does breathing become faster when we do physical exercise ?
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Answer 1

Answer:

When you exercise and your muscles work harder, your body uses more oxygen and produces more carbon dioxide. To cope with this extra demand, your breathing has to increase from about 15 times a minute (12 litres of air) when you are resting, up to about 40–60 times a minute (100 litres of air) during exercise.

Explanation:

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Answer 2

Answer: while exercising our lungs take as much as oxygen as they can

and our muscles work harder and faster

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