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6. During expiration what happens to the diaphragm?

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

7. What is the role of goblet cells?

  • Constrict airway
  • Secrete mucus to trap particles
  • Waft mucus up the airway

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

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

9. What are the walls of the trachea made up of?

  • Goblet cells
  • Ciliates epithelium
  • Cartilage
  • Smooth muscle
  • Elastic fibres

10. Why does blood bring CO2 to the lungs?

  • To increase the concentration of CO2 in the alveolus
  • Maintain diffusion gradient
  • So gaseous exchange is faster
  • Reduce diffusion distance