. The comparative physiology of respiratory mechanisms. Respiration. FUNCTIONS OF BLOOD 103 gen concentrations, while in tropical swamps the low oxygen may be further complicated by rather high C02 tensions. The haemoglobins of many animals show characteristic adapta- tions to these conditions. The blood of the carp, pike, and eel was found to have at 15°C a h of about 10 mm and a /„ at a very low C02 tension ( mm) of 2-3 mm (Krogh and. Fig. 59. eo 40 60 ao /oo teo Part/a/ Pressure of Oxyyen /n mm /iy. m fio Oxygen dissociation curves of carp blood at 15°C and different CO,' tensions. (Blac
. The comparative physiology of respiratory mechanisms. Respiration. FUNCTIONS OF BLOOD 103 gen concentrations, while in tropical swamps the low oxygen may be further complicated by rather high C02 tensions. The haemoglobins of many animals show characteristic adapta- tions to these conditions. The blood of the carp, pike, and eel was found to have at 15°C a h of about 10 mm and a /„ at a very low C02 tension ( mm) of 2-3 mm (Krogh and. Fig. 59. eo 40 60 ao /oo teo Part/a/ Pressure of Oxyyen /n mm /iy. m fio Oxygen dissociation curves of carp blood at 15°C and different CO,' tensions. (Black and Irving.) Leitch, 1919; Black and Irving, 1937). This would make the transfer of oxygen to the tissues extremely difficult were it not that the C02 effect is very large and may raise the tu to 6 mm (at mm C02) and probably beyond. Black and Irving found a tu at 18-20 mm C02 tension of not less than 25 mm (Fig. 59). These adaptations enable the fishes to live in very poor water which would be rapidly fatal, , to trout. Certain invertebrates possessing haemoglobin utilize the pigment only at low oxygen tensions, while diffusion and trans- port in simple solution is sufficient at higher tensions. This point is brought out when the haemoglobin is put out of func- tion by exposing the animals to a low concentration of carbon. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Krogh, August, 1874-1949. Philadelphia, University of Pennsylvania press
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