. The California gray whale : papers presented at the California Gray Whale Workshop, Scripps Institution of Oceanography, 21-22 August 1972. Gray whale; Gray whale -- Physiology; Gray whale -- Behavior. the airway is closed. The duration of the pause in Gigi 11 was ahout I minute, and inspiration and expiration together required about 2 seconds. Two observations can be made from this respiratory pattern (commonly called â â apncustic'"): I) a valve would be needed in order to separate inspira- tion from expiration, and 2) resting lung volume is different from that in terrestrial mammals,
. The California gray whale : papers presented at the California Gray Whale Workshop, Scripps Institution of Oceanography, 21-22 August 1972. Gray whale; Gray whale -- Physiology; Gray whale -- Behavior. the airway is closed. The duration of the pause in Gigi 11 was ahout I minute, and inspiration and expiration together required about 2 seconds. Two observations can be made from this respiratory pattern (commonly called â â apncustic'"): I) a valve would be needed in order to separate inspira- tion from expiration, and 2) resting lung volume is different from that in terrestrial mammals, because in ceta- ceans it includes the tidal volume. Accordingly, we fabricated nonrc- breathing valves: first of approximate- ly 5 inches diameter, and later (for Gigi ID of 8 inch stovepipe (Figure I), thus permitting us to collect un- contaminated exhaled gas. For Gigi 1 a large, calibrated, counterbalanced, bellows-tvpe spirometer was used: and for Gigi 11. expired gas was collected in 900 liter meteorological balloons. The volume of exhaled gas was then measured by emptying the balloons through a calibrated dry gas meter (Wright Respirometer or American Meter Co.)' at a constant, known flowrate. Aliquots of mixed expired gas from Gigi I were analyzed for Og and CO2 with a .Scholander apparatus, and for Gigi II with a moditied Hal- dane apparatus (Lloyd-Gallenkamp). as were samples of end-tidal gas, ob- tained from a port just beyond the expiratory valve leaflet of the nonre- breathing device. Resting lung volume was measured in Gigi II by injecting liters of pure helium into the inspiratory port of the nonrebreathing valve during inspiration. The subsequent expira- tion was captured, and mixed expired gas analyzed for helium with a sensi- tive, calibrated katharometer (W. F. Collins). Arterial blood was drawn Irom Gigi II bs percutaneous puncture of the digital artery in a flipper with an 18 gauge 3 inch needle, and arterial placement ensured by observing pul- sati
Size: 1437px × 1739px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiversit, booksubjectgraywhale
