Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 G8 OHGA>IZATIOX A>-D DETELOPMEM' OF A>-mALS IN GEXERAI,. acid (and water). The exchange of these two gases between the blood and the external medium is the essential part of the respiratory process, and is effected through organs which are suited for carrying on this process either in air or in water. In the simplest cases the exchange of these two gases takes place through the genera] surface of the body; and in all cases, eve
Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 G8 OHGA>IZATIOX A>-D DETELOPMEM' OF A>-mALS IN GEXERAI,. acid (and water). The exchange of these two gases between the blood and the external medium is the essential part of the respiratory process, and is effected through organs which are suited for carrying on this process either in air or in water. In the simplest cases the exchange of these two gases takes place through the genera] surface of the body; and in all cases, even when special respira- tory organs are present, the outer skin aloo takes part in respiration. Fig. 61.—Diagram of the circulation in an animal with a completely separated right and left ventricle, and a double circulation (after Huxley). Ad, right auricle receiv- ing the superior and inferior vense cavse, Veg, and Vci; Dth, thoracic duct, the main trunk of the lymphatic system ; Ad, right auricle; Vd, right ventricle ; Ap, pulmonary artery; P, lung; T j:', pulmon- ary vein ; Af, left auricle; Vs, left ven- tricle ; Ao, aorta; D, intestine; L, liver; yp', portal vein; Lv, hepatic vein. favourable conditions for the inti direct respiration in air, because
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