. Comparative physiology of vertebrate respiration. Vertebrates -- Respiration; Physiology, Comparative. AQUATIC RESPIRATION OF FISHES 23 Water enters the oro-branchial cavity when its volume is increased by a lateral expansion and lowering of the floor, which mainly result from the elastic recoil of the head skeleton. The hypobranchial musculature only comes into action during hyperventilation and when the branchial region expands before biting. The valves of the gill slits are closed and water enters through the mouth and spiracle. During the subse- quent decrease in volume produced by the a
. Comparative physiology of vertebrate respiration. Vertebrates -- Respiration; Physiology, Comparative. AQUATIC RESPIRATION OF FISHES 23 Water enters the oro-branchial cavity when its volume is increased by a lateral expansion and lowering of the floor, which mainly result from the elastic recoil of the head skeleton. The hypobranchial musculature only comes into action during hyperventilation and when the branchial region expands before biting. The valves of the gill slits are closed and water enters through the mouth and spiracle. During the subse- quent decrease in volume produced by the action of the con-. Oro-branchial cavity Parabranchial cavities Fig. 7. Diagram of a dogfish in side view (anteriorly) and horizontal section (posteriorly) to show the path of the respiratory current. The flow is unilateral. The horizontal sections pass through the external gill slits and illustrate the changes in volume of the parabranchial and oro-branchial cavities. Pressures in these cavities are indicated with respect to zero pressure outside the fish. Full line arrows show the movements of the mouth and branchial regions, with their thick- ness indicating the relative strength of 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 Hughes, G. M. (George Morgan). Cambridge, Mass. , Harvard University Press
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