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Echinoderms

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Chapter 13 Secion 4

Chapter 13 Secion 4

Published in: Education, Technology, Business

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  • 1. Echinoderms Chapter 13 Section Four
  • 2.
    • Echinoderms have a hard exoskeleton covered by a bumpy or spiny epidermis; they are radially symmetrical, have a mouth, stomach, and intestines; they have no head or brain, but they do have a nerve ring around the mouth.
    • 1. Echinoderms have a water-vascular system, a network of water-filled canals connected to thousands of tube feet.
  • 3. 2. The water-vascular system allows echinoderms to move, exchange carbon dioxide and oxygen, capture food, and remove wastes.
  • 4. B. About 6,000 species of echinoderms exist.
    • 1. Sea stars have at least five arms arranged around a central point; they reproduce sexually and can regenerate a lost arm.
    • 2. Brittle stars allow a predator to break off an arm, while the brittle star escapes; they quickly regenerate lost parts.
    • 3. Sea Urchins and sand dollars are disk or globe-shaped animals covered with spines.
  • 5. 4. Sea cucumbers are soft-bodied with a leathery covering.
  • 6.
    • C. Echinoderms help recycle materials and are used in research as possible medicine sources.