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Blume Ch. 13.2

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