Page 122 - Color_Atlas_of_Physiology_5th_Ed._-_A._Despopoulos_2003

A. Respiratory muscles
Trachea
Pleura
Lung

External
intercostal
Diaphragm muscles
Internal
intercostal Mechanics of Breathing
Expiration muscles
Inspiration 2 Inspiration
1 Expiration

Lever X‘–Z‘ > X–Y Rib cage rises Plate 5.2
Y Y‘ External intercostal m.
X Y Internal intercostal m.
Y‘
X‘
Z Z‘
Z
Lever X–Y > X‘–Z‘ Rib cage falls Z‘
3 Joint
Vertebra Rib

B. Alveolar pressure PA and pleural pressure Ppl during respiration
Inspiration Expiration
Visceral pleura Parietal pleura Vpulm (L)
Lung Chest wall 0.4
Respiratory 0.2
Rib
Pleural space volume
0
kPa cmH 2 O
PA
+0,2 +2
PA
0 0
–0.2 –2
–0.4 –4
Ppl Ppl 109
–0.6 –6
Despopoulos, Color Atlas of Physiology © 2003 Thieme
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