Biology 28 4 echinoderms

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  • 1. 28-4 Echinoderms
  • 2. endoskeleton
    Structural support located inside the body of an animal.
  • 3. Water Vascular System
    System of internal tubes in echinoderms that carries out essential functions such as feeding, respiration, circulation, and movement.
  • 4. Madreporite
    sievelike structure through which the water vascular system of an echinoderm opens to the outside.
  • 5. Tube foot
    Suction-cuplike structure attached to radial canals of echinoderms; used to walk and to open shells
  • 6. Key Concept
    Echinoderms are characterized by spiny skin, an internal skeleton, a water vascular system, and suction-cuplike structures called tube feet. Most adult echinoderms exhibit five-part radial symmetry.
  • 7. Key Concept
    The water vascular system, which is filled with fluid, carries out many essential body functions in echinoderms, including respiration, circulation, and movement.
  • 8. Key Concept
    Classes of echinoderms include sea urchins and san dollars; brittle stars; sea cucumbers; sea stars; sea lilies and feather stars.