All of the following contain cartilage except:___________?
Correct answer: D. Bronchioles
- A. Larynx
- B. Trachea
- C. Bronchi
- D. Bronchioles
Explanation
The trachea, bronchi and larynx contain cartilage that keeps their air passages open. Bronchioles have no cartilage rings and instead contain smooth muscle, so their diameter can change during breathing. Students often select bronchi because they are smaller than the trachea, but bronchi still possess cartilage plates.
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About Human Respiratory System
The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
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