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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.
As in the trachea, the book lungs exchange oxygen and carbon dioxide through diffusion. The spider's blood, called hemolymph, circulates oxygen, nutrients and hormones to the different organs in the body. Unlike humans, spiders have an open circulatory system.piders have two different types of respiratory systems -- trachea and book lungs (most species have both, but some have one or the other). Compared to human lungs, these respiratory systems are incredibly simple.