The trachea divides at its lower end into
Correct answer: D. two bronchi
- A. alveoli
- B. alveolar ducts
- C. pleural sacs
- D. two bronchi
Explanation
Each primary bronchus enters a lung and branches into ever finer bronchioles ending in alveoli. The division mirrors the need to serve both lungs from a single windpipe.
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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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