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6. Why might failure to move mucus create a problem?

  • pathogenic organisms (germs can multiply and cause infection or illness
  • sticky mucus clogs up the lungs so that oxygen finds it hard to pass through
  • mucus traps pathogens (germs) by sticking to them and keeping them in the bronchi

7. In humans how are substances transported to all distant parts of the body?

  • through the bloodstream
  • through the respiratory system
  • through the nervous system

8. which of these animals would have the largest surface area to volume ratio?

  • horse
  • hippopotamus
  • tiger

9. which of these pairs of organs enables rapid exchange?

  • Liver and Stomach
  • Kidneys and capilleries
  • Heart and lungs