Which of these is the functional unit of the lungs?
Correct answer: B. Alveoli
- A. Air sacs
- B. Alveoli
- C. Bronchi
- D. Bronchioles
Explanation
"Tiny air sacs at the end of the bronchioles (tiny branches of air tubes in the lungs). The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.. In the alveoli, which are the functional units of lungs, the oxygen is taken up, and carbon dioxide is removed from the bloodstream through the alveolar-capillary bed
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About Respiration
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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