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BIOL212

Majors animal: External anatomy of the sea star (matching)

StructureFunction
Spines Calcareous projections for protection and support
Pedicellariae Pincerlike structures believed to kill small organisms that may settle on body surfaces, thus keeping the epidermis free of parasites and algae
Dermal branchiae Gas exchange and excretion through simple diffusion
Mouth External opening to cardiac stomach (through a short esophagus)
Anus Regulates egestion of undigested food (feces) from the body
Madreporite Porous entrance to the water vascular system that serves as both pressure regulator and simple filter
Ambulacral grooves Radiate from the mouth to the tip of each arm and house the tube feet
Tube feet Locomotion and prey capture
Created by: scandalouscanine