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Tiny air sacs where the exchange of gases between air blood takes place. Tiny air sacs found inside the lungs through which oxygen enters and carbon dioxide leaves through the bloodstream during breathing; found on the tips of the bronchioles. Bronchi The trachea divides into these right and left branches providing a passageway for air.
  Alveoli are little air sacs found in bunches (like grapes) at the end of terminal bronchioles. Alveoli are where gas exchange (oxygen goes into blood and carbon dioxide â¦ out of blood) happens as they have sufficiently thin walls and suitably large total surface areas for gas exchange to occur.1 person found this useful. Valentin Popov. 21,056 Contributions.lveoli are where gas exchange (oxygen goes into blood and carbon dioxide â¦ out of blood) happens as they have sufficiently thin walls and suitably large total surface areas for gas exchange to occur. 1 person found this useful. Valentin Popov. 21,056 Contributions.