Which statements about the human gas exchange system are correct?
1) The absence of cartilage in small bronchioles allows them to expand.
2) The walls of the alveoli are made of cuboidal epithelium.
3) Alveoli secrete a substance which reduces surface tension.
4) The trachea and bronchi are supported by rings of cartilage.
1 )
1 and 2
1 and 3
3 )
2 and 4
4 )
3 and 4
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