Question

what is meant by breathing what happened with rate of breathing during vigorous exercise and why

Answer 1

breathing means inhalation and exhalation of air ( oxygen and carbon dioxide )
during vigorous exercise our breathing rate increases because that time we need more energy

Answer 2

Hey friend,
Here is your answer......................................
Breathing is a physical and mechanical process which involves pumping air in and out of Lungs.
During vigorous exercise the breathing rate increases because we need more oxygen.

Hope this helps.
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