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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.
At the very end of these are small sacs called alveoli. In the alveoli, the respiratory system works with the circulatory system. Small blood vessels take oxygen from the alveoli to the heart for distribution to the rest of the body. Blood also brings carbon dioxide to be exhaled back out. When we breathe in or inhale, the air coming into the body has a lot of oxygen.