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31 Cards in this Set

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  • Back
Invertebrates
animals that lack a backbone
vertebrates
animals that have a backbone
Spherical symmetry
can be cut into two identical half anwhere through its center
Radial symmetry
can be cut in half by any longitudinal cut through its center
Bilateral
Can be cut in half by one longitudinal cut through its center which divides the left and right
Epidermis
the 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 push water though a sponge
Amoebocytes
cells that move using pseudopods and perform different tasks 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 jelly-like substance that seperates the epithelial cells in a cnidarian
Nematocysts
small capsules that contain a toxin which is injected into their 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 the creature’s body
Nervous system
a system of sensitive cells that respond to stimuli such as sound, touch, and taste
Ganglia
masses of nerve cells
Hermaphroditic
Possessing both male and female reproductive organs
Regeneration
ability to regrow a missing part of the body
Mantle
a sheath of tissue that encloses the vital oprgans of a mollusk, makes the mollusk’s shell, and performs repiration
Shell
a tough, multi-layered structure secreted by the mantle generally used for protection, sometimes for body support
Visceral hump
a hump that contains a mollusk’s 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
an organ covered with the teeth that mollusks use to scrape food into their mouths
Univalve
an organism with a single shell
Bivalve
an organism with two shells