Which of the following statements about the structure of the respiratory system is correct?

Practice question

Question

Which of the following statements about the structure of the respiratory system is correct?

Options

Choose one · Correct answer highlighted

The trachea is supported by complete cartilaginous rings. Bronchioles lack cartilaginous support and rely on smooth muscle for constriction and dilation. Correct The alveoli are lined with thick layers of connective tissue for protection. Pleural membranes are absent in mammals.

Explanation

Bronchioles do not have cartilaginous rings; instead, they are composed of smooth muscle, which allows them to constrict or dilate.

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