Exploring Invertebrates<br />Biology Notes: Unit 7<br />
I. General Characteristics of Animals<br />A.  Heterotrophic- Must take in food<br />B.  Mobility- Most animals can perfor...
II. Invertebrates<br />Animals without a backbone<br />
III.  Invertebrate Characteristics<br />A. Internal Body Cavities<br />1. coelom- body cavity<br />A. acoelomates- animals...
B. Skeletons<br />1. hydrostatic- use water contained under pressure<br />2. exoskeleton- a rigid external skeleton<br />3...
C. Body Symmetry<br />1. asymmetrical- irregular in shape<br />2. radial- body parts arranged around a central axis<br />B...
Body Symmetry<br />
D. Feeding and Digestion<br />1. intracellular digestion- digestion within special body cells<br />2. gastrovascular cavit...
E. Circulatory System<br />1. open system- blood is not contained in vessels<br />2. closed system- heart circulates blood...
F. Methods of Respiration<br />1. respire through the skin (earthworm)<br />2. use gills (crayfish, fish)<br />3. book lun...
Methods of Respiration<br />gills<br />Book lungs<br />
F. Methods of Excretion<br />1. flame cells<br />2. nephridia<br />3. malpighian tubules<br />
Methods of Excretion<br />
H. Response<br />1. centralization- concentration of nerve cells at anterior end<br />2. cephalization- anterior developed...
I. Types of Reproduction<br />1. asexual-clone of the parent<br />regeneration: can regrow lost body parts<br />Budding :s...
IV. Invertebrate Phyla<br />A. Porifera- sponges<br />
B. Cnidarian- jellyfish, corals, sea anemone<br />
C. Platyhelminthes- flatworms-planaria, tapeworm<br />
D. Nematodes- roundworms<br />
E. Annelids- segmented worms-earthworms, leeches<br />
F. Mollusks- clams, snails, squid<br />
G. Echinoderms- starfish, sea urchin, sand dollar<br />
H. Arthropods- spider, grasshoppers<br />
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Invertebrate notes

  1. 1. Exploring Invertebrates<br />Biology Notes: Unit 7<br />
  2. 2. I. General Characteristics of Animals<br />A. Heterotrophic- Must take in food<br />B. Mobility- Most animals can perform rapid, complex movements<br />C. Multicellularity- Made of more than one cell<br />D. Eukaryotic- Made of true cells with nucleus and organelles <br />
  3. 3. II. Invertebrates<br />Animals without a backbone<br />
  4. 4. III. Invertebrate Characteristics<br />A. Internal Body Cavities<br />1. coelom- body cavity<br />A. acoelomates- animals with no body cavity<br />B. pseudocoelomates- animals with a false body cavity<br />C. coelomates- animals with a true body cavity<br />
  5. 5. B. Skeletons<br />1. hydrostatic- use water contained under pressure<br />2. exoskeleton- a rigid external skeleton<br />3. endoskeleton- an internal skeleton<br />exoskeleton<br />endoskeleton<br />
  6. 6. C. Body Symmetry<br />1. asymmetrical- irregular in shape<br />2. radial- body parts arranged around a central axis<br />Bilateral- right and left sides that are mirror images<br />
  7. 7. Body Symmetry<br />
  8. 8.
  9. 9. D. Feeding and Digestion<br />1. intracellular digestion- digestion within special body cells<br />2. gastrovascular cavity- a digestive sac with only a single opening<br />3. extracellular digestion- food is digested by special organs<br />
  10. 10. E. Circulatory System<br />1. open system- blood is not contained in vessels<br />2. closed system- heart circulates blood inside blood vessels<br />
  11. 11. F. Methods of Respiration<br />1. respire through the skin (earthworm)<br />2. use gills (crayfish, fish)<br />3. book lungs (spider)<br />4. trachea (insects)<br />
  12. 12. Methods of Respiration<br />gills<br />Book lungs<br />
  13. 13. F. Methods of Excretion<br />1. flame cells<br />2. nephridia<br />3. malpighian tubules<br />
  14. 14. Methods of Excretion<br />
  15. 15. H. Response<br />1. centralization- concentration of nerve cells at anterior end<br />2. cephalization- anterior developed into a definite head<br />
  16. 16. I. Types of Reproduction<br />1. asexual-clone of the parent<br />regeneration: can regrow lost body parts<br />Budding :seperation of a parent into 2 or more individuals<br />2. hermaphrodites- contains male and female parts<br />3. sexual- fusion of egg and sperm<br />
  17. 17. IV. Invertebrate Phyla<br />A. Porifera- sponges<br />
  18. 18. B. Cnidarian- jellyfish, corals, sea anemone<br />
  19. 19. C. Platyhelminthes- flatworms-planaria, tapeworm<br />
  20. 20. D. Nematodes- roundworms<br />
  21. 21. E. Annelids- segmented worms-earthworms, leeches<br />
  22. 22. F. Mollusks- clams, snails, squid<br />
  23. 23. G. Echinoderms- starfish, sea urchin, sand dollar<br />
  24. 24. H. Arthropods- spider, grasshoppers<br />

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