Cnidarians By Alexis Hodges
What is a Cnidarian? <ul><li>Are soft bodied, carnivorous animals that have stinging tentacles  arranged in circles around...
Body Plan <ul><li>Cnidarians typically have a life cycle that includes two-different stages; a polyp and a medusa. </li></...
Feeding <ul><li>After a Cnidarian paralyzes its prey, it pulls the prey through its mouth and into the  gastrovascular cav...
Respiration, Circulation, & Excretion <ul><li>The nutrients are usually transported throughout the body by diffusion. </li...
Response <ul><li>Cnidarians gather information from their environment using specialized sensory cells. </li></ul><ul><li>N...
Movement <ul><li>Different Cnidarians move in different ways. </li></ul><ul><li>Some Cnidarians , such as sea anemones, ha...
Reproduction <ul><li>Reproduce both asexually and sexually. </li></ul><ul><li>With most cnidarians , sexual reproduction t...
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Cnidarians Alexis

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Cnidarians Alexis

  1. 1. Cnidarians By Alexis Hodges
  2. 2. What is a Cnidarian? <ul><li>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. </li></ul><ul><li>Get there names from the Cnidocytes, or stinging cells, that are located along their tentacles. </li></ul>
  3. 3. Body Plan <ul><li>Cnidarians typically have a life cycle that includes two-different stages; a polyp and a medusa. </li></ul><ul><li>A polyp is a cylindrical body with arm like tentacles. </li></ul><ul><li>A medusa has a motile, bell-shaped body with the mouth on the bottom. </li></ul><ul><li>Each have a body wall that surrounds an internal space called a Gastrovascular cavity. </li></ul>
  4. 4. Feeding <ul><li>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. </li></ul>
  5. 5. Respiration, Circulation, & Excretion <ul><li>The nutrients are usually transported throughout the body by diffusion. </li></ul><ul><li>Cnidarians respire and eliminate the wastes of cellular metabolism by diffusion through their body walls. </li></ul>
  6. 6. Response <ul><li>Cnidarians gather information from their environment using specialized sensory cells. </li></ul><ul><li>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. </li></ul>
  7. 7. Movement <ul><li>Different Cnidarians move in different ways. </li></ul><ul><li>Some Cnidarians , such as sea anemones, have a hydrostatic skeleton. </li></ul><ul><li>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. </li></ul>
  8. 8. Reproduction <ul><li>Reproduce both asexually and sexually. </li></ul><ul><li>With most cnidarians , sexual reproduction takes place with external fertilization in water. </li></ul><ul><li>Which takes place outside of the females body. </li></ul>

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