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Open Circulatory System

Open Circulatory System. Blood is not always inside blood vessels Heart pumps blood into a short vessel that opens into the body spaces containing the internal organs Blood sloshes over organs and returns eventually to the heart . Open Circulatory System.

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Open Circulatory System

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  1. Open Circulatory System • Blood is not always inside blood vessels • Heart pumps blood into a short vessel that opens into the body spaces containing the internal organs • Blood sloshes over organs and returns eventually to the heart

  2. Open Circulatory System

  3. Mollusks that live in water have gills • Gills = organs that remove oxygen from the water • Gills have cilia that move back and forth, making water flow over the gills

  4. Land Snail Photo credit: NOAA

  5. Aquatic Snails Photo credits: MSC

  6. Slug Photo credit: NOAA

  7. Banana Slug Photo credit: MSC

  8. Nudibranch Photo credit: MSC

  9. More Nudibranchs Photo credits: MSC

  10. Bivalves --clams • http://video.nationalgeographic.com/video/animals/invertebrates-animals/other-invertebrates/weirdest-clam-vs-world/

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