Page 134 - Color_Atlas_of_Physiology_5th_Ed._-_A._Despopoulos_2003

A. Alveolar gas exchange
Alveolus
Pa CO 2 = Pa O 2 = Pa (kPa)
P – v (kPa) 5.33kPa 13.33kPa Lung
(40mmHg) (100mmHg) capillary
5.33 13.33

6.13 5.33
Erythrocyte

kPa mmHg mmHg kPa
100 100 Pulmonary Gas Exchange
12 O 2 12
80 80
10 10
P O 2 P CO 2
8 60 60 8
6 CO 2 6
40 40 Plate 5.8
ca. 0.75s

B. Impairment of alveolar gas exchange
Expiration CO 2 Inspiration
O 2
1 Bronchial system
Normal alveolar
ventilation and perfusion
Extra-alveolar shunt
From pulmonary
artery 4
Non-ventilated alveolus

2
Absent blood flow Alveolar shunt
Functional
dead space
To
3 pulmonary veins
Diffusion barrier 121

Despopoulos, Color Atlas of Physiology © 2003 Thieme
All rights reserved. Usage subject to terms and conditions of license.