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Module #11

Invertebrates Animals that lack a backbone
Vertebrates Animals that possess a backbone
Spherical symmetry An organism possesses spherical symmetry if it can be cut into two identical halves by any cut that runs through the organism's center
Radial symmetry An organism posses radial symmetry if it can by cut into two identical halves by any longitudinal cut through the center
Bilateral symmetry An organism possesses bilateral symmetry if it can only be cut into two identical halves by a single longitudinal cut along its center which divides it into right and left halves
Epidermis An outer layer of cells designed to provide protection
Mesenchyme The jellylike substance that separates the epidermis from the inner cells in a sponge
Collar cells Flagellated cells that push water through a sponge
Amoebocytes Cells that move using pseudopods and perform different functions in different animals
Gemmule A cluster of cells encased in a hard, spicule-reinforced shell
Polyp The sessile, tubular form of a cnidarian with a mouth and tentacles at one end and a basal disk at the other
Medusa A free-swimming cnidarian with a bell-shaped body and tentacles
Epithelium Animal tissue consisting of one or more layers of cells that have only one free surface, because the other surface adheres to a membrane or other substance
Mesoglea The jellylike substance that separates the epithelial cells in a cnidarian
Nematocysts Small capsules that contain a toxin which is injected into prey or predators
Testes Organs that produce sperm
Ovaries Organs that produce eggs
Anterior end The end of an animal that contains its head
Posterior end The end of an animal that contains its tail
Circulatory system A system designed to transport food and other necessary substances throughout a creature's body
Nervous system A system of sensitive cells that respond to stimuli such as sound, touch , and taste
Visceral hump
Created by: horselover14