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book lung
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Illustration showing a cross section of a spider's book lung, with layered lamellae for gas exchange, blood flow between the layers, and air entering through a spiracle opening. Illustration showing different animals and their respiratory organs: a spider with book lungs, a chicken with lungs, a sponge with labeled inflow and outflow pores, a fish with gills, and a caterpillar with spiracles.
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book lung: Media

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Book lung
Diagrammatic section through a book lung.
Encyclopædia Britannica, Inc.
respiration: animals
Different methods of respiration in animals.
Encyclopædia Britannica, Inc.
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