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Question

The transfer of oxygen and other gases between the lungs and blood vessels takes place at


  1. Pharynx

  2. Diaphragm

  3. Trachea

  4. Alveoli


Solution

The correct option is D

Alveoli


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

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