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radiated duct of the digestive tract producing digestive enzymes and also allowing food to be stored
lateral duct or the terminal part of the digestive tract, where waste is stored before being expelled through the anus
canal running the length of the arm; it receives water from the annular canal, which is passed into the tube feet
brings oxygen, nutrients and hormones to cells; fights infection, and helps regulate body temperature
creates a barrier against infection and injury, regulates body temperature and protects us from UV rays
protects the body from disease, collects fluid lost by blood vessels and returns it to the circulatory system
supports the body, protects organs, stores minerals and provides a site for blood formation
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