Biology 26.3

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Biology 26.3

  1. 1. 26-3 Cnidarians
  2. 2. Cnidocyte• Stinging cell of cnidarians; used for defense and to capture prey
  3. 3. Nematocyst• Stinging structure within each cnidocyte of a cnidarian that is used to poison or kill prey
  4. 4. Polyp• Usually sessile stage of the life cycle of a cnidarian that has a cylindrical body with armlike tentacles
  5. 5. Medusa• Motile stage of the life cycle of a cnidarian that has a bell-shaped body.
  6. 6. Gastrovascular Cavity• Digestive chamber with a single opening, in which cnidarians, flatworms, and echinoderms digest food
  7. 7. Nerve Net• Loosely organized network of nerve cells that together allow cnidarians to detect stimuli.
  8. 8. Hydrostatic skeleton• Layers of circular and longitudinal muscles, together with the water in the gatrovascular cavity, that enable movement
  9. 9. External fertilization• Process in which eggs are fertilized outside the female’s body
  10. 10. Key Concept• Cnidarians are soft- bodies, carnivorous animals that have stinging tentacles arranged in circles around their mouths. They are the simplest animals to have body symmetry and specialized tissues.
  11. 11. Key Concept• Cnidarians typically have a life cycle that includes two different- looking stages: a polyp and a medusa.
  12. 12. Key Concept• Cnidarians include jellyfishes, hydras and their relatives, and sea anemones and corals

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