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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