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Module 5 Vocab

Apologia Marine Biology

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