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Fig. 17. Comparison of oxygen content (Co2), Po2, Pco2 and pH of the blood taken from the anterior and posterior ventral aortic circulations (AVA and PVA) of freely swimming, chronically cannulated Channa at 25°C. Ordinal values are blood gas parameters from afferent branchial artery (ABA) 3 and 4 and those from ABA 1 and 2 are plotted along the abscissa. ABA 1 and 2 branch off from the anterior ventral aorta (AVA) and ABA 3 and 4 from the posterior ventral aorta (PVA). Mean ± SD of six measurements made on each fish are given. Dots indicate fish cannulated at ABA 2 and 4, circles indicate fish cannulated at ABA 1 and 3. Figures next to the points are experimental fish numbers. With kind permission from Springer Science + Business Media: <Journal of Comparative Physiology B, Difference in blood oxygen levels in the outflow vessels of the heart of an air-breathing fish, Channa argus: Do separate blood streams exist in a teleostean heart?, 149, 1983, 435–440, Ishimatsu and Itazawa, Fig. 3>.

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