In humans, which of the following structures is used for gaseous exchange?

Nostrils

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Lungs

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Bronchioles

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Alveoli

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Solution

The correct option is D Alveoli
Gas exchange of oxygen and carbon dioxide takes place in the alveoli. Oxygen from the inhaled air diffuses through the walls of the alveoli and adjacent capillaries into the red blood cells. The oxygen is then carried by the blood to the body tissues due to the partial pressure gradient.
Therefore, the correct answer is option D.

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