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9 Cards in this Set
- Front
- Back
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What are cnidarians |
Corals jellyfish anemone blubottes. |
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What are the two types of cnidarians |
Polyps and medusae |
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Poriferans and cnidarians are two cell layers. What is this called? |
Diploblastic |
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Why are jellyfish so big and squishy |
Mesoglea in cnidarians are much bigger than mesohyl in sponges. |
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What are the cells in cnidarian epiderm? |
Epithelio muscular cells - tails with contractile filaments down length of animal (shortening). Sensory and nerve cells - sensory bristles on outer surface. Intersitial cells - totipotent, unspecialised and replace cnidocytes. Cnidocytes- stinging cells |
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What are the cells in the gastroderm? |
Nutritive muscular cells - elongated cellsnwith contractile fibres (elongation). Gland cells - secrete digestive enzymes into gastrovascular cavity. Interstitisl cells. Nerve cells. |
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How to cnidarian polyps move? |
Hydrostatic skeleton. Fixed volume of fluid in closed container. Muscles push against it and changes shape. |
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How do medusa cnidarians detect up and down |
Through statocyst cells. They are round with sensory hairs and nerves. Statolith in the middle. |
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How do medusa cnidarians move? |
Have circular muscles that contract and elongate. The mesoglea is elastic. |
