Cnidarians Alexis
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  • 1. Cnidarians By Alexis Hodges
  • 2. What is a Cnidarian?
    • Are soft bodied, carnivorous animals that have stinging tentacles arranged in circles around their mouths. They are the simplest animals to have body symmetry and specialized tissues.
    • Get there names from the Cnidocytes, or stinging cells, that are located along their tentacles.
  • 3. Body Plan
    • Cnidarians typically have a life cycle that includes two-different stages; a polyp and a medusa.
    • A polyp is a cylindrical body with arm like tentacles.
    • A medusa has a motile, bell-shaped body with the mouth on the bottom.
    • Each have a body wall that surrounds an internal space called a Gastrovascular cavity.
  • 4. Feeding
    • After a Cnidarian paralyzes its prey, it pulls the prey through its mouth and into the gastrovascular cavity. Which is a digestive chamber with one opening.
  • 5. Respiration, Circulation, & Excretion
    • The nutrients are usually transported throughout the body by diffusion.
    • Cnidarians respire and eliminate the wastes of cellular metabolism by diffusion through their body walls.
  • 6. Response
    • Cnidarians gather information from their environment using specialized sensory cells.
    • Nerve net - is a loosely organized network of nerve cells that together allow cnidarians to detect stimuli such as the touch of a foreign object.
  • 7. Movement
    • Different Cnidarians move in different ways.
    • Some Cnidarians , such as sea anemones, have a hydrostatic skeleton.
    • Which consists of layer of circular muscles and a layer of longitudinal muscles that, together with the water in the gastrovascular cavity, enable the cnidarians to move.
  • 8. Reproduction
    • Reproduce both asexually and sexually.
    • With most cnidarians , sexual reproduction takes place with external fertilization in water.
    • Which takes place outside of the females body.