Page 132 - Color_Atlas_of_Physiology_5th_Ed._-_A._Despopoulos_2003
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A. Surface tension (soap bubble model)
r 1 > r 2 ∆P 1 < ∆P 2
∆P
Surface Tension, Lung Function Tests
r r 1
∆P r 2
∆P r
r ∆P 1 ∆P 2
1 2 3 4
B. Maximum breathing capacity (MBC)
Maximum respiratory depth and rate
+2
Normal
+1
Volume (L) 0 Abnormal Plate 5.7
–1
10s Spirometer
Paper feed
C. Forced expired volume in first second (FEV 1 )
Maximum expiratory rate
+2
+1 Abnormal
Volume (L) 0
Normal
–1
1s
Paper feed
1 Measurement
1.0 0.8 0.6 0.4
Forced vital
1.0 capacity (FVC)
Normal Restrictive as fraction of norm
Relative FEV1 0.6
lung disease
0.8
lung disease
lung disease
2 0.4 Obstructive Combined 119
Clinical significance
Despopoulos, Color Atlas of Physiology © 2003 Thieme
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