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www.GOALias.blogspot.comBoojho wants to know ifcockroaches, snails, fish,earthworms, ants and mosquitoesalso have lungs.StrawLime waterFig 10.8 Effect of exhaled air on lime waterThe percentage of oxygen and carbondioxide in inhaled and exhaled air.Inhaled airExhaled air21% oxygen 16.4% oxygenThese openings are called spiracles(Fig. 10.9). Insects have a network of airtubes called tracheae for gas exchange.Oxygen rich air rushes through spiraclesinto the tracheal tubes, diffuses into thebody tissue, and reaches every cell ofthe body. Similarly, carbon dioxide fromthe cells goes into the tracheal tubes andmoves out through spiracles. These airtubes or tracheae are found only ininsects and not in any other group ofanimals.TracheaeLungs0.04% carbondioxide4.4% carbondioxide10.5 B10.5 BREATHINGIN OTHERANIMALSAnimals such as elephants, lions, cows,goats, frogs, lizards, snakes, birds, havelungs in their chest cavities like thehuman beings.How do these organisms breathe? Dothey also have lungs like those of humanbeings? Let us find out.Cockroach: A cockroach has smallopenings on the sides of its body. Otherinsects also have similar openings.Fig.10.9 Tracheal systemEarthworm: Recall from Chapter 9 ofClass VI that earthworms breathethrough their skins. The skin of anearthworm feels moist and slimy ontouching. Gases can easily pass throughthem. Though frogs have pair of lungslike human beings, they can alsobreathe through their skin, which ismoist and slippery.115RESPIRATIONIN ORGANISMS115