1) Which statement BEST describes gaseous exchange? a) The movement of air in and out of the lungs. b) The chemical release of energy from food. c) Is the process where by one gas is exchanged in preference to another. d) None of the above. 2) What is the site of gaseous exchange? a) bronchus b) bronchioles c) trachea d) alveoli 3) Which gas is diffused from the alveoli into the surrounding blood capillaries? a) Carbon dioxide b) Oxygen 4) Oxygen is needed in body cells for a) excretion b) respiration c) nutrition d) egestion 5) Oxygen is carried by which type of blood cells? a) red b) white c) platelets d) None 6) Carbon dioxide is an acidic gas produced as a waste product of respiration and if allowed to accumulate can affect the blood pH. True or False? a) True b) False 7) Which adaptation concerning the alveoli is False? a) Are thin to maximize diffusion rate of gases. b) Constantly moving. c) Have a continuous and rich blood supply. d) Have a small surface area. e) Are always damp or moist. 8) Which option is FALSE concerning inspired and expired air? a) Inspired and expired air contains different amount of Nitrogen. b) 21% of O2 is present in inspired air and 16% in expired air. c) 4% of CO2 in expired air and 0.04 % in inspired air. d) Water vapour is saturated in expired air where as in inspired air it varies. 9) O2 has a greater composition in inspired air as oppose to expired air because a) it is not used up. b) it is used up in respiration. 10) There is no change in concentration of Nitrogen in both inspired and expired air because a) it is used up. b) it is not used by the body because its bond is too strong and stable.

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