Respiratory tubules are termed as bronchioles when they attain the diameter _ or lesser:
Correct answer: C. 1 mm
- A. 1.2 cm
- B. 1 cm
- C. 1 mm
- D. 1.2 mm
Explanation
When the smaller bronchi attain a diameter of one mm or less, then they are called bronchioles. Bronchi have the same cartilage rings as the trachea, but the rings are progressively replaced by irregularly distributed cartilage plates, and the bronchioles totally lack cartilage. Bronchioles are made up mainly of circular smooth muscles.
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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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