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By Breathing :D That's all. Try not to breath, your respiratory stops even your circulatory. If you don't breath, the pathways of the bloods will be blocked/stopped.
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The Respiratory system obtains oxygen through air by inhaling, which then the oxygen will be distributed to your blood vessels as the inhaled air passes through the surrounding capillaries. The Circulatory system let's the blood that contains the oxygen be circulated and distributed throughout your body
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