Junior Cert Science - Biology - The Breathing Systemrespiratory.jpg

Gap-Filling Quiz

Type the answers (or copy and paste them) into the blank boxes.
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   alveoli      attack      blood      bronchioles      cancer      capillaries      carbon      cells      Exhaled      expelled      increase      increases      oxygen      trachea   
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 .