A)
P
Q
R
S
Alveolar
Venule
To pulmonary vein
From pulmonary artery
B)
P
Q
R
S
Bronchiole
Arteriole
To pulmonary artery
From pulmonary vein
C)
P
Q
R
S
Alveolus
Capillary
To pulmonary vein
From pulmonary artery
D)
P
Q
R
S
Lung
Air sac
To pulmonary artery
From pulmonary vein
Correct Answer: C
Solution :
The alveolus is well supplied with a network of capillaries. Gaseous exchange takes place across the thin membranes.
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