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Which statements about the human gas exc...

Which statements about the human gas exchange system are correct?
I. The absence of cartilage in small bronchioles allows them to expand.
II. The walls of the alveoli are made of cuboidal epithelium.
III. The recoil of the elastic fibres surrounding the alveoli helps to move air out during expiration.
IV. The trachea and bronchi are supported by circles of cartilage.

A

I and II

B

I and III

C

II and IV

D

III and IV

Text Solution

Verified by Experts

The correct Answer is:
B
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