1. During expiration what happens to the diaphragm?
- Pushes digestive organs down
- Relaxes and is pushed up
- Becomes flatter
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Other questions in this quiz
2. How does the capillary wall reduce diffusion distance?
- One cell thick
- Few cells thick
- Flattened or thin cells
3. 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
4. Smooth muscle mainly makes up what wall in the respiratory system?
5. What type of epithelium is found in the walls of the alveolus?