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Module 5 Vocab
Apologia Marine Biology
Term | Definition |
---|---|
mantle | a sheath of tissue surrounding the organs of a mollusk, producing the mollusk's shell and performing respiration |
radula | an organ covered with hundreds of small teeth, used for scraping food into the mouths of mollusks |
chitin | a derivative of carbohydrates that provides both flexibility and support |
open circulatory system | a circulatory system in which blood flows out of the blood vessels and into body cavities, where it comes in direct contact with cells |
closed circulatory system | a circulatory system in which the blood always remains in vessels |
molting | the process of shedding an exoskeleton and replacing it with a new one |
cephalothorax | the anterior part of an arthropod body, consisting of a head and other body segments fused together |
carapace | an armored shield that covers the anterior portion of crustaceans |
water vascular system | a network of water-filled canals in echinoderms, used for locomotion and feeding |
ambulacral groove | a channel along the oral surface of echinoderms through which the tube feet protrude |
notochord | a flexible supportive rod that runs the length of the body of the chordates |
dorsal nerve cord | a long bundle of nerve cells located along the dorsal part of an organism's body |