NCERT pg no. 183 Special vascularised structures called gills (branchial respir

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NCERT pg no. 183
Special vascularised structures called gills (branchial respir

NCERT pg no. 183
Special vascularised structures called gills (branchial respiration) are used by most of the aquatic arthropods and molluscs whereas vascularised bags called lungs (pulmonary respiration) are used by the terrestrial forms for the exchange of gases. Among vertebrates, fishes use gills whereas amphibians, reptiles,birds and mammals respire through lungs.