Which of the following parts of the respiratory system is involved in the absorption of oxygen in the blood stream?

Trachea

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Alveoli

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Nose

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Bronchi

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Solution

The correct option is B Alveoli

During inhalation, the air is taken in by the nose and is passed to the lungs.

Lungs contain specialised structures called alveoli, which are the sites for gaseous exchange and these alveoli are surrounded by the capillaries.

Oxygen present in the alveoli diffuses into the capillaries and enters the blood stream.

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