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Life Science: Invertebrates 1

Invertebrate An animal without a backbone.
Spongin A fibrous protein that functions like a skeleton in certain sponges.
Spicule Sharp pointed structures in spongin made of calcium carbonate.
Filter Feeder An organism that obtains food from water circulating through its body.
Nematocyst A type of stinging cell possessed by certain cnidarians; used for defense or paralyzing prey.
Bilateral Symmetry Symmetry in which one plane divides a structure in half from top to bottom.
Radial Symmetry Symmetry in which several different planes can divide a structure in half through the center.
Neuron A long thin cell that carries impulses.
Nerve A bundle of neurons arranged side by side and wrapped in a protective covering.
Ganglion A mass of nerve tissues; sometimes called a simple brain.
Stimulus Anything that causes a response in an organism.
Sensory Receptor A structure capable of receiving stimulus from the environment.
Circulatory System A system of transporting blood throughout an organism.
Aortic Arches Organs that help control blood pressure in earthworms.
Water Vascular System A series of canals and tubules in echinoderms used for feeding and movement.
Capillary One of many SMALL blood vessels with walls one cell thick.
Vein Larger blood vessels that carry blood to the heart (open).
Collar cells Cells in a sponge with flagella to pump water.
Osculum The opening in a sponge that excretes water and unused nutrients.
Free Living An animal that does not live inside and is not living dependent to another animal.
Parasite A living organism that lives within, obtains nutrition from , and harms another living organism.
Medusa The freely-swimming, umbrella- or disk-shaped gelatinous form of Cnidarians.
Flagella A long whip-like tail as a part of a cell.
Cilia Short hair-like structures on cells.
Siphons A tube which forces water through an organism for movement.
Nerve Net A network of neurons apparently continuous with one another and conducting impulses in all directions.
Pharynx The tube that extends from the mouth and connects to the digestive tract and respiratory tract.
Radula A muscular ribbon in mollusks (other than bivalves) which scrapes for food with sharp teeth-like structures.
Crop A pocket-like place where food is stored in earthworms prior to the gizzard.
Gizzard The part of an earthworm's digestive tract that breaks down food by grinding it with muscles.
Porifea Sponges
Cnidaria Sea jellies, Corals, Anemones.
Platyhelminthes Flat worms.
Nematoda Round worms.
Mollusca Mollusks - Snail, Clams, Octopus, Squids.
Annelida Segmented worms.
Echinodermata Sea stars, Urchins, Sand dollars.
Digestive glands A group of tissues that produce enzymes for breaking down food.
Ring canal The circular water tube that surrounds the esophagus of echinoderms.
Regenerate Able to grow back.
Univalve ONE piece shell.
Bivalve TWO piece shell.
Gastrovascular cavity An opening in the digestive system of a simple animal that breaks food down into the cellular level.
Polyp A body form of a cnidarian, such as a hydra or coral, that is cylindrical in shape, has a mouth usually surrounded by tentacles at one end, and is often attached to something at the other end.
Created by: MsRobinG



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