page_title: Book lung
hierarchical_section_title: Book lung
context_page_description: A book lung is a type of respiration organ used for atmospheric gas exchange that is present in many arachnids, such as scorpions and spiders. Each of these organs is located inside an open ventral abdominal, air-filled cavity and connects with the surroundings through a small opening for the purpose of respiration.
context_section_description: A book lung is a type of respiration organ used for atmospheric gas exchange that is present in many arachnids, such as scorpions and spiders. Each of these organs is located inside an open ventral abdominal, air-filled cavity (atrium) and connects with the surroundings through a small opening for the purpose of respiration.
caption: In this spider diagram, the book lung is labelled 1.
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