Which of the following parts of the respiratory system has no cartilage?
Correct answer: C. Bronchioles
- A. Larynx
- B. Trachea
- C. Bronchioles
- D. Bronchi
Explanation
Terminal Bronchioles is the last part of the conducting portion of the respiratory system, and has the smallest diameter of all (less than 1mm). There is no cartilage, or glands, some smooth muscle is still present, there are no goblet cells. The epithelium is either columnar or cuboidal.
This question appeared on the NUMS 2022 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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