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18 Cards in this Set
- Front
- Back
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How do you make a metazoan? |
Start out simple - single-celled organisms such as amoebas |
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Importance of Choanoflagellates |
Flagellum can be used for motion but with the collar can be used to create a current and draw in food Reproduce asexually, and it is easy to create many of them |
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Choanoflagellates and ______ |
Colonies The colonies arose because it makes them more efficient, can create a bigger current to draw in more food and can take turns resting This bring the beginning of many cells with a similar purpose |
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Phylum Proifera |
Sponges |
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Most basic metazoan body plan |
Sponges - single layer of tissue (collared cells) Thread-like collared cells weave together to form the outer layer around a rigid structure Fractal-like organization |
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Phylum Cnidria/Coelenterata |
Sea pens, soft corals, jellyfish, anemones Fractal pattern seen Eat and poop out of same holes |
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2 Layers of tissue phylum |
Cnidria/Coelenterata |
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Names of the 2 layers of tissue |
Ectoderm and endoderm |
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How did the endoderm arise? |
Most likely from the invagination of the ectoderm |
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What is the ectoderm and endoderm? |
Endoderm is the inner tissue/gut, ectoderm is the outer layer of tissue |
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Most complex metazoan body plan |
Worms of bilaterals |
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What are the 3 layers of tissue? |
Ectoderm, mesoderm, and endoderm |
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Fractal geometry breaks down in ______ body plan |
Bilateral |
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The Coelom |
Endoderm and ectoderm are essentially continuous Mesoderm is a little more complicated in that it actually lines a fluid-filled body cavity called the coelom Within the coelom is where the internal organs and gut develop |
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Protostomes |
Coelom develops directly from mesodermal tissue - mollusks, arthropods Mouth develops before the anus |
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Deuterostomes |
Coelom develops from out-pockets of the gut (endoderm) - chordates, echinoderms Anus develops before the mouth |
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Initial use of the Coelom |
a hydraulic device for moving |
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Benefit of a coelom |
Allows movement - if you could move, you could protect yourself from predators/the environment and it also allowed transport of oxygen without needing water as a medium and without compromising ectoderm effectiveness or size Could evolve skeletons |
