lectures on respiratory physiology diffusion. swim bladder of a fish
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Lectures on respiratory physiologyLectures on respiratory physiology
DiffusionDiffusion
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Swim bladder of a fish
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Fick’s law of diffusion through a tissue sheet
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Very thin blood-gas barrier
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Electron micrograph of pulmonary capillary
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High power view of blood-gas barrier
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Fick’s law of diffusion through a tissue sheet
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Kinetic theory of gases
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Fick’s law of diffusion through a tissue sheet
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Diffusion and perfusion limitations
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0 10 20 30 40 50 60 70 80 90 1000
10
20
30
40
50
60
70
80
90
100
110
PARTIAL PRESSURE, mm Hg
CO-Hb DISSOCIATION CURVES
AT
UR
AT
ION
, % CO
O2
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Diffusion and perfusion limitations
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Very thin blood-gas barrier
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Thickened blood-gas barrier
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Time courses of Po2 in the capillary
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Measurement of Diffusing Capacity
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Single breath method for DCO
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Electron micrograph of pulmonary capillary
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Reduced Hb
O2 solution
Mixing Chamber
t
Spectro Photometer
HBO2 %
100
0 0.1 0.2
time (sec)
Measurement of the rapid reaction of O2 with Hb
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The two components of DL
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Is the transfer of CO2 ever limited by diffusion?