4-14 notes - animals

4-14 notes - animals - st with tissues-Flatworms 1 st...

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4/14/09 Animals Science Headlines *Oxytocen: feel good, connection hormone *Pheromones: chemical mating signals Use concentrated insect pheromones for insect control in crop plants Kingdom- Animalia General Characteristics: Multicelled Aerobic Heterotrophic -ingest other organisms Reproduce sexually usually (sometimes asexually) Motile at some point of their lives Symmetry is found in most (not all) bodies—lowest forms lack symmetry -bilateral: identical on both sides (higher animals) -Radial: symmetrical around a central axis (starfish) Fossil records date to 900mya More than 2,000,000 known species -invertebrates (no backbone): >1,950,000 -vertebrates (have backbone): <50,000 11 phyla of animals -Sponges: no tissues, no organs, no symmetry (some of the earliest species) -Cnidarians: “flower of the sea”(coral), 1
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Unformatted text preview: st with tissues-Flatworms: 1 st animals with organs *Tapeworms (undercooked meat)- takes up vit.b12 & can = anemia *Blood flukes(trans. thru standing h2o& requires snail) causes shistosomiasis -Roundworms (nematodes): most abundant animals on earth (insects have more species/not total numbers), 1 st to have complete digestive system Hookworms Elephantiasis is caused by a roundworm-Rotifers: only animals that can tolerate complete desiccation-Mollusks: 1 st with a body cavity (“coelom”)-Arthropods: over half of world’s animal species, have exoskeletons, 3 major groups: 1. Insects: 6 legs, respiratory structures (not lungs), etc. 2. Spiders (arachnids): 8 legs 3. Crustaceans: crab, lobster, centipedes -Echinoderms: no central brain, sensors in various body parts Sea cucumbers, starfish...
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This note was uploaded on 04/16/2009 for the course ISB 202 taught by Professor Johnson during the Spring '08 term at Michigan State University.

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4-14 notes - animals - st with tissues-Flatworms 1 st...

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