Human physiology : designed for colleges and the higher classes in schools and for general reading . LARVA OF THEMAY-FLY. RE9PIRATORY VPPARATFS OF III K WATER-PCORPION. 100 HUMAN PHYSIOLOGY. Respiration in birds. Appnrntus for it extensive. into every part of the body. There are lungs, so to speak,everywhere in the insect. 147. The apparatus of respiration is largely developed inbirds for two objects—to provide for the extensive change inthe blood which is required by their great activity, and to givelightness to the body. To secure these objects there are air-sacs connected with the lungs, an
Human physiology : designed for colleges and the higher classes in schools and for general reading . LARVA OF THEMAY-FLY. RE9PIRATORY VPPARATFS OF III K WATER-PCORPION. 100 HUMAN PHYSIOLOGY. Respiration in birds. Appnrntus for it extensive. into every part of the body. There are lungs, so to speak,everywhere in the insect. 147. The apparatus of respiration is largely developed inbirds for two objects—to provide for the extensive change inthe blood which is required by their great activity, and to givelightness to the body. To secure these objects there are air-sacs connected with the lungs, and located in different parts ofthe body; and in birds that fly rapidly and are long upon thewing, these sacs are very extensive, and even many of thebones are made hollow, and are connected with the air this arrangement, the air is introduced extensively to theblood in the capillaries on the walls of these sacs, and at thesame time the body is made very light. And the heat gener-ated by the effort of flying must expand the air in the air-sacsand swell them out, and thus make the body lighter. In Fig. 47is
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Keywords: ., bookauthorhookerwo, bookcentury1800, bookdecade1850, bookyear1854
