The site of gaseous exchange in humans is:
Correct answer: D. Alveoli
- A. Bronchioles
- B. Trachea
- C. Alveolar Sacs
- D. Alveoli
Explanation
The site for gaseous exchange is the alveoli. Inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli. •Options A, B, and C are incorrect as they function as passages for airflow to alveoli. The pathway of airflow is Nostrils>Larynx>Trachea>Bronchi>Bronchioles>Alveolar sacs>Alveoli
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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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