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Sea anemones are members of the phylum of Cnidaria. Distinguishing features of this phylum are radial symmetry and the presence of cnidocytes, or stinging cells (like the ones found in jelly fish). These cells have a mechanical trigger and if activated a subcellular harpoon is fired and paralyzing and painful toxin is injected. A cnidocyte diagram is shown ...


As the siphuncle pumps cameral liquid out of a chamber, the pressure of the chamber falls and nitrogen, oxygen, and some carbon dioxide diffuse into the chamber. Sea water gas pressures are in equilibrium with atmospheric gases (oxygen and nitrogen) and are in equilibrium with nautilus blood. Hence as cameral liquid is pumped out of the chamber, gases ...

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