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Chapter 25 Vocab

pharynx in freeliving flatworms, the tube like muscular organ that can extend out of the mouth and such food particles into the digestive tract.
flame cell in flatworms, a cilia lined, bulblike 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
regeneration ability to replace or regrow body parts missing due to predation or damage.
scolex parasitically adapted, knob-like anterior end of a tapeworm, having hooks and suckers that attach to the host's intestinal lining
proglottid continuously formed, detachable section of a tapeworm that contains male and female reproductive organs, flame cells, muscles, and nerves
hydrostatic skeleton the pseudocoelom in roundworms; the fluid within a closed space that gives rigid support for muscles to work agianst
trichinosis disease caused by eating raw or undercooked meat, usually pork, infected with trichinella larvae
mantle membrane that surrounds a mollusks internal organs
radula rasping tongue like organ with rows of teeth that many mollusks use in feeding.
gill respiratory structure of most mollusks and aquatic artropods
open circulatory system blood is pumped out of vessels into open spaces surrounding body organs
closed circulatory system blood is confined to the vessels as it moves through the body
nephridium structure through which most mollusks eliminate metabolic wastes from cellular processes.
siphon tubular organ through which octopuses and squids eject water, at times so rapidly that their movement appears jet-propelled.
crop sac in which food and soil are stored until they pass to the earthworms gizzard
gizzard muscular sac in birds that contains hard particles that help grind soil and food before they pass into the intestines
seta tiny bristle that digs into soil and anchors an earthworm as it moves forward
clitellum thickened band of segments that produce a cocoon from which young earthworms hatch
Created by: rroberto