1.%20Asymmetrical,%20Radial,%20or%20Bilateral - PowerPoint PPT Presentation
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1.%20Asymmetrical,%20Radial,%20or%20Bilateral
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patterns of organization 1. asymmetrical, radial, or bilateral 2. unicellular, diploblastic, or triploblastic 3. acoelomate, psuedocoelomate, or coelomate – PowerPoint PPT presentation
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Title: 1.%20Asymmetrical,%20Radial,%20or%20Bilateral
1
Patterns of Organization
- 1. Asymmetrical, Radial, or Bilateral
- 2. unicellular, Diploblastic, or triploblastic
- 3. Acoelomate, Psuedocoelomate, or coelomate
2
The Three Arrangement of Appendages
- Asymmetrical appendages are arranged in no set
pattern. - Examples sea sponges
- many protists
- These animals do not have
- complex sensory,
- communication, or
- locomotor functions.
3
Arrangement of Appendages
- Radial appendages are arranged in a circular or
spherical pattern - Examples octopus, sea stars, sea urchins, etc.
- Advantages can sense predators or prey coming
from any direction. - Disadvantages these animals are usually
sedentary or have minimal locomotion.
4
Arrangement of Appendages
- Bilateral Animals with a distinct left and
right side, front and back, and head and foot
regions. - Examples us, dogs, whales, squirrels, tigers,
etc. - Advantages have excellent locomotion.
- Disadvantages can only see the world primarily
in one direction. - The evolution of a distinct head with many
sensory inputs is called cephalization.
5
Unicellular, Diploblastic, or Triploblastic
- Unicellular the whole animal is just one tiny
cell. Example protists - Diploblasts Animals who only have an endoderm
and ectoderm, no mesoderm. Only have tissue
level organization, no real organs. Examples
jellyfish, hydra. Picture - Triploblasts animals with all three layers of
tissue and true organ systems. Usually display
bilateral symmetry. Examples us, horses, cows,
llamas, etc. - Triplobalsts are further classified based upon
whether or not they have an internal body cavity! - Next slide
6
- Go back
7
Advantages of Having an Internal Body Cavity
- Body cavity a fluid-filled space in which the
internal organs can be suspended and separated
from the body wall. - 1. provides more room for organs to grow and
develop. - 2. allows for an increase in overall body size.
- 3. provides more surface area for gas, nutrient,
and waste exchange. - 4. acts as a hydrostatic skeleton.
8
Acoelomates, Pseudocoelomates, Coelomates
- Acoelomates triploblasts with no body cavity,
flatworms. - Pseudocoelomates triploblasts with a body
cavity that is NOT connected to their mesoderm,
roundworms. Pseudo means false. - Coelomates triploblasts with a body cavity that
IS connected to their mesoderm, most animals.
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