In double circulation , the heart pumps fixed blood to the body parts. Does this means that the deoxygenated blood is also circulated again ?

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no,only oxygenated blood.
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The heart pumps deoxygenated blood to the lungs.....the deoxygenated blood is collected from the cells of the body through capilleries and then sent to the heart from where the deoxygenated blood goes to the lungs to get oxygenated...
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