Match up the beginning of the sentences and its appropriate endings: 1. external respiration involves taking oxygen into the body and 2. from the nose and mouth, air flows 3. the trachea divides 4. the respiratory tract is lined with 5. the mucus in the respiratory tract is continually moved 6. during heavy exercises, the depth and rate of ventilation 7. the larynx is also known as 8. each of the two lungs is surrounded 9. the pleural cavities are filled 10. air flows into the lungs when ( a) by cilia; b) increases dramatically; c) by its pleural cavity; d) into the larynx & windpipe; e) the chest wall & diaphragm move to increase the volume of the thorax; f) getting rid of excess carbon dioxide; g) with fluid; h) into the right and left bronchi; i)the voice box or adam’s apple; j) a layer of sticky mucus)
