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Chapter 25 vocab

Biology 2 vocab

TermDefinition
Flame Cell IN flatworms, a cilia-lined, bulb like cell that moves water and certain substances into excretory tubules for elimination outside the body.
Ganglion Group of nerve-cell bodies that coordinates incoming and outgoing nerve impulses.
Pharynx In free-living flatworms, the tube like muscular organ that can extend out of the mouth and suck food particles into the digestive tract.
Proglottid Continuously formed, detachable section of a tapeworm that contains male and female reproductive organs, flame cells, muscles, and nerves; breaks off when its eggs are fertilized and passes out of the host's intestine.
Regeneration Ability to replace or regrow body parts missing due to predation or damage.
Scolex Parasitically adapted, knoblike anterior end of a tapeworm, having hooks and suckers that attach to the host's internal lining.
Hydrostatic skeleton The pseudocoelom in roundworms; the fluid within a closed space that gives rigid support for muscles to work against.
Trichinosis Elongated, cylindrical structure that can discharge a spine like structure that may function in defense, as an anchoring device, or to capture prey.
Closed Circulatory System Blood is confined to the vessels as it moves through the body.
Gill Respiratory structure of most mollusks and aquatic arthropods.
Mantle Membrane that surrounds a mollusk's internal organs.
Nephridium Structure through which most mollusks eliminate metabolic wastes from cellular processes.
Open Circulatory System Blood is pumped out of vessels into open spaces surrounding body organs.
Radula Rasping tongue like organ with rows of teeth that many mollusks use in feeding.
Siphon Tubular organ through which octopuses and squids eject water, at times so rapidly that their movement appears jet-propelled.
Clitellum Thickened band of segments that produce a cocoon from wich young earthworms hatch.
Crop Sac in which food and soil are stored until they pass to the earthworm's gizzard.
Gizzard Muscular sac in birds that contains hard particles that help grind soil food before they pass into the intestines.
Seta Tiny bristle that digs into soil and anchors an earthworm as it moves forward.
Created by: Jsmith3