The [pulmonary] circuit carries blood to the [lungs] to be [oxygenated] and then back to the [heart]. In the lungs, [carbon dioxide] is removed from the blood, and oxygen taken up by the [haemoglobin] in the red blood cells. The [systemic] circuit carries blood around the [body] to deliver the oxygen and returns [de-oxygenated] blood to the heart. Blood also carries [nutrients] and [waste]..

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