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Mod 13A/B Animal Pt1
Module 13 A/B Animals - Invertibrates Part 1
| Term | Definition |
|---|---|
| Spherical Symmetry | an organism possesses this if it can be cut into two identical halves by any cut that runs through the organism's center |
| Invertebrates | animals that lack a backbone |
| Vertebrates | animals that possess a backbone |
| Radial symmetry | an organism possesses this if it can be cut into two identical halves by any longitudinal cut though its center |
| Bilateral symmetry | an organism possesses this if it can only be cut into two identical halves by a single longitudinal cut along its center that divides it into right and left halves |
| Anterior end | the end of the animal that contains the head |
| Posterier end | the end of the animal that contains the tail |
| Epidermis | an outer layer of cells designed to provide protection |
| Endodermis | an inner layer of cells |
| 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 that is injected into prey or predators |
| Testes | organs that produce sperm |
| Ovaries | organs that produce eggs |
| Closed circulatory system | a system in which blood stays in vessels 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 female reproductive organs |
| Regeneration | the ability to regrow a missing part of the body |
| Open circulatory system | a system in which blood is pumped through vessels into various chambers or body cavities where it comes in direct contact with cells, tissues, and organs |
| Mantle | a sheath of tissue that encloses the vital organs of a mollusk, makes the mollusk's shell, and functions in respiration, waste disposal, and sensory perception |
| 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 |
| Cephalization | the concentration of sense organs and nerves in the head of an animal |
| Spicules | found mostly in the mesenchyme, these are made of lime or silica and provide a framework that supports the sponge |
| Spongin | a tough web of protein that supports a sponge |
| Gastrovascular cavity | the digestive sac where extracellular digestion begins in a cnidarian |
Created by:
MelRodriguez
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