Respiration; buccal and opercular pumps

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How do we know about the existence of this dual pumping mechanism? The application of modern, sensitive, and stable pressure transducers has resulted in accurate pressure measurements in both the buccal and opercular cavities. The recordings show that the gills have an appreciable resistance to water flow so that a differential pressure is always present, with the gradient from buccal to opercular cavity. In other words, pressure in the buccal cavity is nearly always positive with respect to pressure in the opercular cavity.
With sensitive pressure transducers we can also record the time course of the differential pressure between the two cavities. In a perch-like fish, for example, a wrasse of the genus Crenilabrus (family Labridae), the two pumps are balanced. That is, Phase 1 and Phase 3 have more-or-less equal time duration.
Page 1 and 2: BIOLOGY OF FISHES FISH/BIOL 311 FUN
Page 3 and 4: The average human can utilize only
Page 5 and 6: Within the pattern, however, can be
Page 7 and 8: Diagrammatically, we can express th
Page 9 and 10: Phase 3: The Buccal Pressure Pump:
Page 11: The timing of the expansion and con
Page 15 and 16: In other pelagic forms, the pumps m
Page 17 and 18: In truly benthic forms, especially
Page 19 and 20: 3. STRUCTURE AND FUNCTION OF GILLS
Page 21 and 22: In all bony fishes there are muscle
Page 23 and 24: Deoxygenated blood reaches the gill
Page 25 and 26: Three-dimensional cut-away view thr
Page 27 and 28: List of Air-breathing Fishes Arrang
Page 29 and 30: Lateral views of the gill arches of
Page 31 and 32: Gills are never used for air breath
Page 33: What is the biological significance

Respiration; buccal and opercular pumps

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