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book lungs

book lungs One of the two kinds of respiratory organ (compare TRACHEAL SPIRACLES) found in spiders. They are located in the abdomen, just below the pedicel, and are composed of many fine leaves. Blood is passed over a large surface area to absorb oxygen. The openings of the book lungs (branchial opercula) are situated on the ventral surface of the abdomen and may be closed to prevent water loss. Book lungs are believed to be the ancestral type of respiratory organ in arachnids.

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book lung

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.

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"book lung." The Columbia Encyclopedia, 6th ed.. . Retrieved November 11, 2018 from Encyclopedia.com: https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/book-lung

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