Question

question 62
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which prevents the collapse of the trachea and bronchi?
mucus
rings of cartilage
hilum
carina
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Explanation:

The trachea and bronchi are part of the respiratory system. Cartilage rings are C - shaped structures. They provide structural support. This support prevents the trachea and bronchi from collapsing during inhalation and exhalation. Mucus mainly traps dust and pathogens. The hilum is the area where blood vessels and nerves enter/exit the lungs. The carina is a ridge at the tracheal bifurcation.

Answer:

Rings of cartilage