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Because your body is working "overtime" because you are exercising, your muscles and all your body organs are needing more energy and oxygen, this is because your body is working more than usual. Your body needs to do many things such as sweat, which helps you cool down, and to get energy to all of your cells in your body to help you carry on exercising, if your body didn't do this, then you wouldn't be able to carry on exercising. The blood supply then has to increase because it has to go to the parts in your body which you are exercising the most eg. If you are taking a run, the blood supply will increase because your legs will need more energy, therefore there will be more blood circulating your legs than normal because you are overworking them? Does this make sense?

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16y ago

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