Sunday, 28 June 2015

Respiratory System - Sample Question and Answer

Why do we breathe faster when we exercise?

When we exercise, our body needs more energy. We breathe faster to take in more oxygen at a faster rate so that our body cells can carry out cellular respiration faster to release more energy.
When we exercise, our body cells also produce more carbon dioxide. We breathe faster to exhale this greater amount of carbon dioxide faster.

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