Concept explainers
To define:
The term pedicellaria, water vascular system, madreporite, tube feet and ampulla.
Explanation of Solution
Pedicellaria is a defensive organ present in the echinoderms. It is a pincer like structure specifically found in the sea stars.
Water vascular system is a hydraulic system that is present in the echinoderms and used for locomotion, respiration, and transportation of food and wate in the body.
Madreporite is a perforated structure from which the entry of the water in to water vascular system of echinoderms is controlled.
Tube feet are locomotory organs of tube feet on the underside of the echinoderms. They use this to feed, breathe and move.
Ampulla is a structure present in the tube feet of echinoderms that helps in intake of the water from the external environment.
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