Other questions in this quiz

2. During expiration what happens to the diaphragm?

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

3. 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

4. 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

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

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

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