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Roundworms have no heart or formal blood vessels.

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16y ago

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Roundworms have a simple circulatory system with a dorsal blood vessel that runs the length of the body and pumps nutrients and oxygen to the tissues. The blood is not contained within vessels but rather flows freely in the body cavity. Gas exchange occurs through diffusion across the body wall.

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9mo ago
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Q: What is the circulatory system for roundworms?
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