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Chapter 13 Key Terms
The keyterms from chapter 13.
15
Science
7th Grade
04/11/2011

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Term
appendage
Definition
jointed structure of athropods such as legs, wings, or antennae
Term
closed circulatory system
Definition
blood circulation system in which blood moves through the body in vessels
Term
crop
Definition
digestive system sac in which earthworms store ingested soil
Term
exoskeleton
Definition
thick, hard, outer covering that protects and supports arthropod bodies and provides places for muscles to attach
Term
gill
Definition
organ that exchanges carbon dioxide for oxygen in the water
Term
gizzard
Definition
muscular digestive system structure in which earthworms grind soil and organic matter
Term
mantle
Definition
thin layer of tissue that covers a mollusk's body organs
Term
metamorphosis
Definition
process in which many insect species change their body form to become adults
Term
molting
Definition
shedding and replacing of an arthropod's exoskeleton
Term
open circulatory system
Definition
blood circulation system in which blood moves through vessels and into open spaces around the body organs
Term
radula
Definition
in gastropods, the tongue like organ with rows of teeth used to scrape and tear food
Term
setae
Definition
bristlelike structures on the outside of each body segment that helps segmented worms move
Term
spiracle
Definition
opening in the abdomen and thorax of insects through which air enters and waste gases leave
Term
tube feet
Definition
hydraulic, hollow, thin-walled tubes that end in suction cups and enable echinoderms to move
Term
water-vascular system
Definition
network of water-filled canals that allow echinoderms to move, capture food, give off wastes, and exchange carbon dioxide and oxygen
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