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 surfactant which reduces surface tension in the lungs.
4 The trachea and bronchi are supported by circles of cartilage.
1 )
1 and 2
1 and 3
3 )
2 and 4
4 )
3 and 4
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