The Cardiovascular System of JellyfishJellyfish do not have a specialized circulatory system, but they use diffusion as a way to circulate materials throughout their body. Almost every cell is in contact with the environment and so they are in direct contact with the nutrients and materials they need. They do use diffusion, though, so that the materials circulate throughout the body. Also diffusion helps aid the second inner layer to receive all the nutrients, materials, and oxygen it needs. Jellyfish skin is thin enough for oxygenation to occur just by direct diffusion and because of this they do not require gills or lungs.
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