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Over the course of a fifteen minute run, your muscles need to release energy in order to move. This requires glucose, some of which is stored in the muscle cells, but much more has to be carried in the bloodstream. An increased bloodflow is also necessary to carry oxygen to the muscles (for aerobic respiration), and to remove carbon dioxide, which builds up (as a result of aerobic respiration too). This means your breathing rate increases as you need to inhale/exhale more gas, and your heart rate increases also to transport substances to and from the muscles quickly. You may sweat as well, as heat is produced as an inevitable waste product of respiration.

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Q: What happens in your body when you run?
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