Exchange and transport

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1. Why does blood bring CO2 to the lungs?

  • Maintain diffusion gradient
  • Reduce diffusion distance
  • So gaseous exchange is faster
  • To increase the concentration of CO2 in the alveolus
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2. What is the tidal volume?

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

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

  • Squamous
  • Ciliated

4. What is the role of cilia in the trachea?

  • Waft mucus up the airway to the back of the throat
  • Secrete mucus to trap particles
  • Help the trachea contract

5. What happens to the pressure in the chest cavity during inspiration?

  • Drops below atmospheric pressure
  • Rises above atmospheric pressure
  • Nothing


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