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TRBC Bio M11 Terms

Terms for Module 11

QuestionAnswer
Invertebrates Animals that lack a backbone
Vertebrates Animals that possess a backbone.
Spherical symmetry An organism possesses sperical symmetry if it can be cut into two identical halves by any cut that runs through its 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 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 The 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 sesile, 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 separates the epithelial cells in a snidarian.
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.
Hermaphroditic Possessing both the male and the female reproductive organs.
Regeneration The ability to regrow a missing part of the body.
Mantle A sheath of tissue that encloses the bital organs of a mollusk, makes the mollusk's shell, and performs respiration.
Shell A tough, multilayered structure secreted by the mantle, generally used for protection, but 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 teeth that mollusks use to scrape food into their mouths.
Univalve An organism with a single shell
Bivalve An organism with two shells.
Created by: sdushaw
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