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Biology

WCHS Biology Chapter 29

WordDefinition
Ray long tapered arms of some echinoderms that are covered with short, rounded spines
Pedicellaria pincerlike appendages on echinoderms used for protection and cleaning
Water Vascular System in echinoderms, the hydraulic system that operates under water pressure; aids in locomotion, gas exchange, and excretion
Madreporite in echinoderms, the sievelike, disk-shaped opening through which water flows in and out of the water vascular system; helps filter out large particles from entering the body
Tube Foot in echinoderms, hollow, thin-walled tubes that end in a suction cup; part of the water vascular system, they also aid in locomotion, gas exchange, and excretion
Ampulla in echinoderms, the round, muscular structure on a tube foot that aids in locomotion
Notochord long, semirigid, rodlike structure found in all chordate embryos that is located between the digestive system and the dorsal hollow nerve cord
Dorsal Hollow Nerve Cord nerve cord found in all chordates that forms the spinal cord and brain
Pharyngeal Pouch paired openings located in the pharynx behind the mouth; aids in feeding and digesting
Created by: dmoudy
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