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30 Cards in this Set

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Invertebrates
Animals that lack a backbone
Vertebrates
Animals that possesses a backbone
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 possesses radial symmetry if it can be cut into two identical halves by any longitudinal cut through its center.
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
outer layer of cells designed to provide protection
Mesenchyme
the jelly like substance that separates the epidermis from the inner cells in a sponge
Collar cells
flagellated cells that pump water into a sponge
Amebocytes
cells in a sponge that perform digestion and transport functions
Polyp
a sessile, tubular chidarian with a mouth and tentacles at one end 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 otehr surface adheres to a membrane or other substance
Mesoglea
jelly-like substance that separates the epitelial cells in a cnidarian
Nematocysts
small sapsules that contain a toxin which is injected into prey or predators
Testes
the organ that produces sperm
ovaries
organ that produces eggs
anterior end
the end of an animal that contains its head
posterior end
the end of an animal that contains the tail
circulatory system
a system designed to transport food and other necessary substances throughout a creatures body
nervous system
a system of sensitive cells that respond to stimuli such as sound, touch, and taste
Ganglia
masses of nerve cell bodies
Hermaphroditic
possessing both the male and the female reproductive organs
regeneration
the ability to re-grow a missing part of the body
mantle
a sheath of tissue that encloses the vital organs of a mollusk, makes the mollusk's shell, and performs respiration
shell
a tough, multi-layered structure secreted by the mantle. It is usually used for protection, but sometimes for body support
visceral hump
a hump that contains a mollusks heart, digestive, and excretory organs
foot
a muscular organ that is used for locomotion and takes a variety of forms depending on the animal
radula
a organ covered with teeth that mollusks use to scrape foodinto their mouths
univalve
an organism with a single shell
bivalve
an organism with two shells