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LIFE SCI: INVTBRTS1
Life Science: Invertebrates 1
Term | Definition |
---|---|
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. |