<p>Humans at Work Questions - Section 2</p><p>842 001 P 8.4.2. 3 - 4 Marks 1</p><p>Why is the lining of the lungs (alveoli) moist? A. to dissolve carbon dioxide so it can diffuse into the blood B. to dissolve oxygen so it can diffuse into the blood C. to trap micro organisms and dust particles D. to increase the surface area of the lungs</p><p>Answer D</p><p>842 002 P 8.4.2. 3 - 4 Marks 4</p><p>Outline why two of the following safety procedures or equipment would be needed when breaking up concrete (see diagram)</p><p>Face protection Ear protection Eye protection Steel capped boots Appropriate clothing</p><p>Marking Criteria Marks Relates natural sources of light to eye damage 3 – 4 Identifies UVB and UVC radiation as the cause of damage Outlines two examples of problems caused by natural light Identifies UV radiation as the cause of damage 1 - 2 Outlines one example of problems caused by natural light or Identifies two examples of problems caused by natural light</p><p>Sample Answer</p><p>842 003 P 8.4.2. 3 - 4 Marks 3 a. Name two reasons for the Occupational Health and Safety Act 2000 [1 mark] b. Outline one of these reasons [2 marks]</p><p>842 004 P 8.4.2. 3 - 4 Marks 4</p><p>Examples of a respiratory condition caused by environmental factors include asthma and asbestosis.</p><p>For one of these diseases a. Outline the cause of the disease [2 marks] b. Identify two symptoms [2 marks]</p>