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.

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Presentation transcript:

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

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

Land Snail Photo credit: NOAA

Aquatic Snails Photo credits: MSC

Slug Photo credit: NOAA

Banana Slug Photo credit: MSC

Nudibranch Photo credit: MSC

More Nudibranchs Photo credits: MSC

Bivalves --clams nimals/invertebrates-animals/other- invertebrates/weirdest-clam-vs-world/ nimals/invertebrates-animals/other- invertebrates/weirdest-clam-vs-world/

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