Why Does Breathing Rate Increase during Exercise?

Answer

Breathing rate increases during exercise because your body has a higher demand for oxygen. Oxygen is needed to burn calories and so your lungs have to work harder. Your lungs, heart, and muscles all work together to ensure you are getting enough oxygen for your exercise.
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Your breathing increases during exercise because your working muscles need extra oxygen in order to burn energy. You pull oxygen into your lungs, and it is transferred to the bloodstream
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Simple: the muscles need more O2 under exercise induced stress. That means you breathe faster to increase O2/CO2 exchange in your lungs, & your heart beats faster to deliver blood
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