The gas-exchange portion of the human respiratory system is the-

Layrnx

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Trachea

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Bronchi

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Alveoli

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Solution

The correct option is A Alveoli
The gaseous exchange in the human respiratory system takes place between the alveoli and capillaries of the lungs. Both the alveoli and capillaries are single made of a single layer of cells, the endothelium or the squamous epithelium that permits the exchange or diffusion of gases, that is oxygen (alveoli) and carbon dioxide (capillaries).
So, the correct answer is 'Alveoli'.

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