In humans, the exchange of gases between air and blood takes place in the
Correct answer: A. alveoli
- A. alveoli
- B. bronchi
- C. trachea
- D. larynx
Explanation
The millions of thin walled alveoli provide the enormous surface where oxygen enters the blood and carbon dioxide leaves. The bronchi and trachea are only conducting tubes, with no gas exchange through their walls.
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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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