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  • Close up of a sea stars (starfish) tube feet.
    Rights: Kathleen E. Conlan PhD Published 14 August 2017 Size: 23 KB Referencing Hub media

    Sea stars have a very unusual circulatory system. They do not pump blood around their bodies. Instead, they use seawater and a complex water vascular system to keep things moving. Their tube feet, also used for movement, are an important part of this circulatory system. Sea stars have hundreds of tube feet on their underside.

    Acknowledgement: Kathleen E. Conlan PhD

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