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Question

The exchange of oxygen and other gases between air in the lungs and blood vessels takes place in:


  1. Diaphragm

  2. Trachea

  3. Alveoli

  4. Pharynx


Solution

The correct option is C

Alveoli


Alveoli are the terminal ends of the lung tissues. The exchange of gases between the lungs and the blood stream takes place at the alveoli. Alveoli are nothing but sacs made up of a very thin membrane through which gaseous exchange can take place.

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