Exchange and transport

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1. Why does blood bring CO2 to the lungs?

  • Maintain diffusion gradient
  • To increase the concentration of CO2 in the alveolus
  • Reduce diffusion distance
  • So gaseous exchange is faster
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2. Smooth muscle mainly makes up what wall in the respiratory system?

  • Alveolus
  • Trachea
  • Bronchioles
  • Bronchi

3. What is the tidal volume?

  • Volume of air that always remains in he lungs
  • Inspiratiory/expiratory reserve volume
  • Volume of air moved in and out at rest
  • Largest volume of air that an be moved in and out in one breath

4. What type of epithelium is found in the walls of the alveolus?

  • Squamous
  • Ciliated

5. During expiration what happens to the diaphragm?

  • Relaxes and is pushed up
  • Contracts
  • Becomes flatter
  • Pushes digestive organs down


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