1) Where in the respiratory system does gas exchange take place? a) Alveoli b) Trachea c) Bronchioles d) Lungs 2) Which of the following contracts to cause inhalation of breath? a) Lung b) Diaphragm c) Bronchus d) Trachea 3) Where do you find the intercostal muscles? a) In the lung b) Below the diaphragm c) Between the ribs d) Above the diaphram 4) What percentage of the air breathed out is oxygen? a) 21% b) 18% c) 16% d) 23% 5) Which of these gases can the protein haemoglobin carry? a) Ammonia and methane b) Nitrogen and hydrogen sulphide c) Oxygen and carbon dioxide d) Oxygen and ammonia 6) The movement of gases from an area of high concentration to an area of low concentration is called? a) Contraction b) Diffusion c) Evaporation d) Transmission 7) What is measured by the peak flow test? a) Vital capacity b) Total lung capacity c) Tidal volume d) Tidal capacity 8) Which gas is produced by the muscles during exercise as a waste product? a) Oxygen b) Carbon dioxide c) Lactic acid d) Hydrogen 9) What is a lung capacity of an average adult ? a) 1 litre b) 6 litres c) 8 litres d) 10 liters 10) Where does the respiration take place? a) Muscle  b) Lungs c) ATP d) Mitochondria

Respiratory system Re-cap

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