The following nasal passages are composed of cartilage except:
Correct answer: C. Bronchioles
- A. Trachea
- B. Bronchus
- C. Bronchioles
- D. Tracheoles
Explanation
The correct answer is Bronchioles. Bronchioles do not contain cartilage, unlike the trachea and bronchi, which have cartilage to maintain their structure. Instead, bronchioles rely on smooth muscle to regulate airflow. The trachea and bronchus need the structural support provided by cartilage rings to prevent collapse during respiration. The option of tracheoles refers to insect anatomy, which is irrelevant in the context of human respiratory anatomy.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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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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