KnowraPulmonary circulationLinked fromLinked fromThe 19 pages that link to Pulmonary circulation, each with the reason it gives.All 19Broader topic 7Related 7Narrower topic 3Compared with 2Book lungCompared with: Unlike vertebrate lungs, book lungs exchange gases with hemolymph rather than blood in a pulmonary circuit.Venous returnCompared with: It is a separate circuit from systemic venous return, though both connect through the heart.