The Lungs

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The breathing system takes in and removes dioxide. When we breathe in, travels in the air through the and bronchi, into the and finally reaches numerous sac-like structures called . The thin surfaces of the alveoli are in contact with vessels called . At the alveoli, oxygen enters the blood to be carried to in the body. Waste carbon dioxide in the is excreted at the alveoli and in the air we breathe out. air contains more carbon dioxide than inhaled air. The rate of breathing with exercise. Smoking can the risk of lung infection, and heart .