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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.
The Breathing System of Insects. The tracheal breathing system of insects. Insects do not breathe through their mouths as we do. The do not have lungs and their blood, which is a watery, yellowish liquid, does not carry oxygen and carbon dioxide around their bodies.he process of breathing in insects is slow. Large, active insects, however, may pump their abdomens to help quicken the movement of these gases. It is interesting to note that the tracheae are supported by strengthening rings, just like the tracheae in our breathing system.