A) cuboidal epithelium
B) columnar epithelium
C) stratified cuboidal epithelium
D) squamous epithelium
Correct Answer: D
Solution :
There are 300 millions of alveoli (also called acini) in two lungs. The alveoli have very thin wall consisting of squamous epithelium. The wall of alveoli has an extensive network of blood capillaries interspersed with elastic and reticular connective tissue fibres. Due to very intimate contact of blood capillaries with the alveoli, the exchange of gases takes place easily.
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