book lung


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book lung,

terrestrial respiratory organ characteristic of arachnids such as scorpions and primitive spiders. Each book lung consists of hollow flat plates. Air bathes the outer surface of the plates and blood circulates within them, facilitating the exchange of gases. In most species, adequate gas exchange occurs without any muscular movement to ventilate the lung.

book lung

[′bu̇k ‚ləŋ]
(invertebrate zoology)
A saccular respiratory organ in many arachnids consisting of numerous membranous folds arranged like the pages of a book.
References in periodicals archive ?
2] = oxygen consumption at 20[degrees]C, BLV = book lung volume, [D.
In this study we hypothesized that Grammostola rosea Walckenaer 1837, an active predator of large size which depends entirely on its two paired book lungs, has a low energy strategy based on large respiratory surface area and a thin air-hemolymph barrier.
Glycoprotein staining after using the PAS reaction clearly detailed many delicate deposits of chitin lining chambers of the book lung (Figs.
The thickened, spirally arranged reinforcements (T) that adjoin the heart chamber and its surrounding musculature also are slightly stained, possibly due to strongly acidic groups of their constituent glucosamine polymers, as is also evident in the thin walls that delimit air pockets in the book lungs (Fig.