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Fig. 11. Comparison of the central circulatory system of Channa and of typical teleosts (a) and the photograph of the heart of Channa argus after a sagittal section was cut on the median plane (b). Two ventral aortae arise from the bulbus arteriosus. The anterior aorta extends anteriorly but is partly cut between the 1st and 2nd afferent branchial arteries in b. The posterior aorta runs more dorsally and soon divides into the 3rd and 4th afferent branchial arteries. Note also the highly trabeculate ventricular lumen, muscular ridges running on the inner wall of the bulbus and the absence of the sino-atrial valve. The ventral vascular wall of the buccal cavity is also highly vascular, supplied with blood from the efferent side of the 1st and 2nd gill arches (dotted vessels in a). Arrows in a indicate the direction of blood flow. A atrium; ABO air-breathing organ; acv anterior cardinal vein; ava anterior ventral aorta; BA bulbus arteriosus; ccv common cardinal vein (=ductus Cuvieri); da dorsal aorta; hv hepatic vein; ijv inferior jugular vein; pcv posterior cardinal vein; pva posterior ventral aorta; scv subclavian vein; SV sinus venosus; V ventricle; va ventral aorta; VW vascular wall of the buccal cavity. 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, Figs. 1 and 2>.

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