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Chapter 25 vocab
Biology 2 vocab
Term | Definition |
---|---|
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. |