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Unit 8 Invertebrates

Unit 8 Invertebrates. Ch. 29 Comparing Invertebrates. Invertebrate Phylogeny. Evolutionary Trends. All invertebrates except sponges exhibit some type of body symmetry Invertebrates with cephalization can respond to the environment in more sophisticated ways than simpler invertebrates.

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Unit 8 Invertebrates

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  1. Unit 8 Invertebrates Ch. 29 Comparing Invertebrates

  2. Invertebrate Phylogeny

  3. Evolutionary Trends • All invertebrates except sponges exhibit some type of body symmetry • Invertebrates with cephalization can respond to the environment in more sophisticated ways than simpler invertebrates

  4. Form & Function in Invertebrates • The simplest animals break down food primarily through intracellular digestion, (digested inside cells), but more complex animals use extracellular digestion, (in a digestive tract)

  5. Form & Function in Invertebrates • Respiratory organs have large surface areas that are in contact with the air or water • Also, for diffusion to occur the respiratory surfaces must be moist

  6. Form & Function in Invertebrates • Most complex animals move blood through their bodies using 1 or more hearts & either an open or a closed circulatory system

  7. Form & Function in Invertebrates • Most animals have an excretory system that rids the body of metabolic wastes while controlling the amount of water in tissues

  8. Form & Function in Invertebrates • Invertebrates show 3 trends in the evolution of the nervous system: centralization, cephalization, & specialization

  9. Form & Function in Invertebrates • Invertebrates have 1 of 3 main kinds of skeletal systems: hydrostatic skeletons, exoskeletons, or endoskeletons

  10. Form & Function in Invertebrates • Most invertebrates reproduce sexually during at least part of their life cycle • Depending on environmental conditions, however, many invertebrates may also reproduce asexually

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