is/are involved in the absorption of oxygen in our respiratory system.

Trachea

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Alveoli

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Diaphragm

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Bronchi

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Solution

The correct option is B Alveoli
$∙$ During inhalation, air is taken in by 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 capillaries.
$∙$ Oxygen present in the alveoli diffuses into the capillaries and enters the blood stream.

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