Smooth muscles are found in all the mentioned below except:
Correct answer: D. Alveoli
- A. Trachea
- B. Bronchi
- C. Bronchioles
- D. Alveoli
Explanation
Bronchi are larger airway passages in the respiratory system, and they are primarily lined with cartilage for structural support. Smooth muscles are found in the trachea (Option A) and bronchioles (Option C), where they play a role in regulating the diameter of the airways and controlling airflow. Alveoli (Option D) are small air sacs in the lungs where gas exchange occurs, and they do not contain smooth muscles.
This question appeared on the UHS MDCAT 2023 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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