Respiratory System

3. any of the major air passages of the lungs which diverge from the windpipe
6. a dome-shape muscular partition which separates the chest from the abdomen
7. a pair of breathing organs located in the chest which remove carbon dioxide and bring oxygen to the blood
9. a flap of cartilage in the oesophagus which stops food from entering the windpipe
10. a cluster of sacs at the end of the bronchioles where gas exchange occurs
12. the tube which carries air from the nose and mouth into the chest cavity

1. the action of breathing
2. small tubes or branches which form from the division of the trachea
4. a hollow tube at the back of the nose which connects the mouth and nose to the oesophagus
5. space inside the nose which allows air to move through
8. large air tubes or passages which are formed by the division of the trachea
11. holds the vocal cords and vocal box