Module 11 Definitions

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Module 11 Definitions
2011-02-11 11:27:43
Biology Definitions Module Apologia

Module 11 Definitions in Apologia
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  1. Invertebrates
    Animals that lack a backbone.
  2. Vertebrates
    Animals that possess a backbone.
  3. Spherical symmetry
    An organism possess shperical symmetry if it can be cut into two identical halfs by any cut that runs through the organisms center.
  4. Radial symmetry
    An organism possess radial symmetry if it can be cut into two identical halfs by any longitudinal cut through it's center.
  5. Bilateral symmetry
    An organism posses bilateral symmetry if it can only be cut into two identical halfs by a single longitudinal cut along it's center which divides it into right and left halfs.
  6. Epidermis
    An outer layer of cells design to provide protection.
  7. Masenchyme
    The jelly-like substance that separates the epidermis from the inner cells in a sponge.
  8. Collor cells
    Flagellated cells that pump water into a sponge.
  9. Amebocytes
    Cells in a sponge that perform digestion and transport functions.
  10. Gemmule
    A cluster of cells incased in a hard spicule-reinfored shell.
  11. Polyp
    A sessile tubular cnidarian with a mouth and tentacles at one end, and a basal disc at the other.
  12. Medusa
    A free swimming cnidarian with a bell shaped body and tentacles
  13. Epithelium
    Animal tissue consisting of one or more layers of cells that have only one free surface, because the other suface adheres to a membrane or other substance.
  14. Mesoglea
    The jelly-like substance that separates the epithelial cells in a cnidarian.
  15. Nematocysts
    Small capsules that contain a toxin that is injected into prey or preditors.
  16. Testes
    The organ that produces sperm.
  17. Ovaries
    The organ that produces eggs.
  18. Enterior end
    The end of an animal that contains it's head.
  19. Posterior
    The end of an animal that contains the tail.
  20. Circulatory system
    A system designed to transport food and other necassary substances throughout a creatures body.
  21. Nurvous system
    A system of sensitive cells that respond to stimuli such as sound, touch, and taste.
  22. Ganglia
    Masses of nurve cell bodies.
  23. Hermaphroditic
    Possessing both the male and the female reproductive organs.
  24. Regenoration
    The ability to regrow a missing part of a body.
  25. Mantle
    A sheath of tissue that incloses the vital organs of a mollusk, makes the mollucks cell, and preforms resporation.
  26. Shell
    The tough, multilayered structure secreted by the mantle. It it usual used for protection, but sometimes for body support.
  27. Visceral hump
    A hump that contains a mollusks heart, digestive, and excretory organs.
  28. Foot
    A muscular organ that is used for locomotion and takes a veriaty of forms depending on the animal.
  29. Radula
    An organ covered with teeth that mollusks use to scrape food into their mouths.
  30. Univalve
    An organism with a single shell.
  31. Bivalve
    An organism with two shells.