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Blume Ch. 13.2
| Question | Answer |
|---|---|
| Annelids (A nuh ludz) | – “little rings” – tube shaped bodies that are divided into many segments – setae (SEE tee) bristle like structures on the outside of each body segment, they help it move and “sense” the environment |
| Segmented Worms | bilateral symmetry a body cavity that holds organs 2 body openings (mouth & anus) can live in freshwater, salt water, & moist soil EX: earthworms, marine worms and leeches are annelids (segmented worms) |
| Earthworm Dissection Video | http://www.youtube.com/watch?v=u9HHS1uPFSo |
| Digestion & Excretion | It takes soil into it’s mouth. This goes to the crop – a sac used for storage. Behind the crop is the gizzard – a muscular structure which grinds the soil and the bits of organic mater. This ground up matter passes to the intestines where the organic m |
| earthworms | The taking in of soil to get food helps provide spaces for air and water to flow through the soil and mix the soil ! This is good for the soil. Their wastes pile up at the openings to their burrows – these piles are called castings. Castings help |
| circulation | closed circulatory system 2 blood vessels: one along the top and one along the bottom they meet in the front 5 heart-like “aortic arches” these pump blood smaller vessels go into each body segment |
| circulation | Try this quiz at this link: <a href="http://www.softschools.com/quizzes/biology/earthworm_circulatory_system/quiz5662.html">Earthworm Circulatory System</a> when you see it click on Earthworm Circulatory System Quiz - Soft Schools then click on |
| respiration | No gills or lungs !! Oxygen and Carbon-dioxide exchange through their skin. (it is covered with a thin watery mucus) **Never touch an earthworm with dry hands. **Never remove their thin mucus layer. |
| nerve response | Earthworms have a small brain in their front segment. Nerves in each segment join to form the main nerve cord that connects to the brain. They respond to light, temperature, & moisture. |
| reproduction | Earthworms are hermaphrodites. Like the sponge it makes both sperm and eggs, but it can’t fertilize its own eggs. It has to receive sperm from another earthworm to reproduce. |
| Marine Worms- Polychaetes | More than 8000 species. (PAH lee keets) They float, burrow, build structures, or walk along the ocean floor. Some can produce their own light. |
| polychaete | Some can live 540m deep. like earthworms, they have segments but their setae occur in bundles (polychaete means “many bristles” |
| Christmas tree worm | This sessile, bottom dwelling polychaete, the Christmas tree worm has special tentacles that exchanges oxygen and carbon dioxide as well as gather food. |
| bristleworm | Free-swimming polychaetes, like this bristleworm have a head with eyes, a tail and parapodia. (per uh POH dee uh) These are paired, fleshy outgrowths on each segment that help it move and get food. |
Created by:
llessmann
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