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Ch 28.1

Ch 28.1. What is an Animal?. ?. Cnidaria: jelly fish, corals, sponges etc. Chordata: sea squirts, lizards, fishes, humans. . . . Nematoda: Roundworms. Echinodermata: starfish, sea urchins, sea cucumbers . . . Platyhelminthes: planaria, tapeworm . . .

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Ch 28.1

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  1. Ch 28.1 • What is an Animal?

  2. ?

  3. Cnidaria: jelly fish, corals, sponges etc

  4. Chordata: sea squirts, lizards, fishes, humans. . .

  5. Nematoda: Roundworms

  6. Echinodermata: starfish, sea urchins, sea cucumbers . . .

  7. Platyhelminthes: planaria, tapeworm . .

  8. Annelida: segmented worms, leeches . .

  9. Fish

  10. Chordata: Vertabrata: dog, human . .

  11. Animal ?? • Yes.

  12. All animals: • Are multicellular • Feed on other organisms • Can move in some way to obtain food • Break down food to be used as energy or building tissue. • Unlike plants, animals have no cell walls to support the body.

  13. Obtaining food: • Heterotrophic: They obtain energy and nutrients from outside sources. • Move to find food: birds, humans . . • Draw food toward them: barnacles, sponges . .

  14. Digest food: • Internal: intestines: frogs, fish • Intercellular: inside cells: sponges, flatworms

  15. Development of Animals: • Sperm finds egg

  16. Zygote • Sperm and egg are one object, one cell, ready to start multiplying.

  17. In Humans:

  18. In all animals: See figure 28.5 • Sperm and egg • Zygote • 2 cell • 4 cell • 8 cell • Blastula: ball of cells • Gastrula: infolding

  19. Animal Body Plans: • Asymmetry: irregularly shaped • Radial symmetry: left and right are equal if cut down ANY middle • Bilateral symmetry: left and right from midline equals mirror image

  20. Body plans for Bilateral symmetry: • All have body cavities where internal organs are found. • Accept Acoelomates: flatworms: 3 cell layers w/ digestive tract but no body cavities.

  21. Pseudocoelomate: Roundworms: a Fluid-filled body cavity partly lined.

  22. Coelomate: Segmented worms, fish, lizards, humans, . . . Internal organs are in the open cavety (coelom) Spinal cord skin

  23. Protection: • Exoskeleton: hard outside • Endoskeloton: support framework inside body.

  24. Last slide • Invertebrate: an animal w/out a backbone. • Vertebrate: with a backbone

  25. Quiz • Tomorrow when you walk in on the information you just wrote down. • Open note, open book. • Limited time per question.

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