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Spiders obtain their oxygen through four respiratory organs located on the underside of their abdomens. These organs are arranged into two pairs, an anterior pair at the very front end of the abdomen, and a posterior pair behind the anterior pair.
Like humans, spiders take in oxygen and let out carbon dioxide. The arrangement of the âstacksâ looks much like the pages of a book, hence the name, âbook lungâ. Book lungs are the original, or âprimitiveâ, form of respiration in spiders. Some spiders have more advanced respiratory organs called tubular tracheae. Depending on the family or specific species, a spider can have both respiratory organs (one pair of book lungs AND one pair of tubular tracheae).