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