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Biology Module 11
The Invertebrates of Kingdom Animalia
| Term | Definition |
|---|---|
| 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 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 | An 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 through a sponge |
| Amebocytes | 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 | A 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 produces sperm |
| Ovaries | Organs that produces 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 |
| Ganglia | Masses of nerve cell bodies |
| 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 vital 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:
vernahale
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