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Animal Characteristics

Animal Characteristics. Characteristics of animals. Feeding- Must consume food. Does not produce it’s own food. Heterotrophic Respiration- Takes in oxygen and gives off CO2 Circulation-Has a means to distribute O2 Excretion- Means to eliminate waste

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Animal Characteristics

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  1. Animal Characteristics

  2. Characteristics of animals • Feeding- Must consume food. Does not produce it’s own food. Heterotrophic • Respiration- Takes in oxygen and gives off CO2 • Circulation-Has a means to distribute O2 • Excretion- Means to eliminate waste • Response –Respond to environment using specialized cells • Movement-Able to move from one place to another. Mobile • Reproduction- Able to reproduce sexually • Eukaryotic- Cell with cell membrane and true nuclei.

  3. Development of animals • Fertilization- sperm and egg join together (1n+1n=2n) • Mitosis of 2n cell = 2 cells, 4 cells, 8 cells,.16…32……. • Now get a hollow ball of cells called a BLASTULA that is filled with fluid • One side of blastula pinches inward to form GASTRULA • Hole that forms is called BLASTOPORE

  4. BLASTULA GASTRULA

  5. Animals Grouped by Fate of Blastopore • Depending on what becomes of blastopore animals are divided into 2 groups • 1. blastopore becomes mouth- PROTOSTOME(then second opening becomes anus) • 2. blastopore becomes anus –DEUTEROSTOME(then second opening is mouth) • Cells then differentiate for animal to reach adulthood.

  6. Gastulation is what forms an inside and an outside of the organism. • Inside layer called ENDODERM-becomes lining of the gut • Outside layer of cells called ECTODERM-becomes skin and nervous system • Some animals have a 3rd middle layer called MESODERM-becomes the circulatory system, muscle system, and excretory system

  7. Symmetry • Animals can be divided into groups by their symmetry.

  8. Asymmetry • No symmetry • Asymmetrical • sponges

  9. Radial symmetry • Organism can be divided along any plane • Jellyfish

  10. Bilateral Symmetry • Organism has left and right • Anterior and posterior • Front and Back • Ventral and Dorsal

  11. Animals with 3 body layers • Animals with 3 body layers(Ectoderm,Endoderm, and Mesoderm) can be divided into 3 groups depending on how much of their body cavity is covered by mesoderm. • Body cavity is called COELOME

  12. Acoelomate • No body cavity. • Digestive tract runs length of body • Flatworms • Solid all the way through

  13. Pseudocoelomate(false cavity) • Space between endoderm and mesoderm is filled with fluid • Coelome not compltely covered by mesoderm, just partially • 1 way digestive tract • Round worm

  14. Coelomate(true body cavity) • True body cavity all surrounded by mesoderm • Fluid filled • Contains specialized organs • Humans, Earthworm

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