1. Bellwork
How many red blood cells can fit through a capillary at a time?
Capillaries are how many cells thick?
How many cells thick are alveoli?
What two adaptations of alveoli reduce the distance for gases to diffuse?
How does the moist lining of each alveolus affect gas exchange?

2. Gas exchange is necessary to maintain:
high levels of O2 (for aerobic respiration)
low levels of CO2 (waste product)
This gas exchange occurs through dissolution (process of dissolving) and diffusion!

3. BUT…
How can we get
a higher concentration of O2 and CO2?

4. Ventilation !

5. Why Ventilate?

7. How is air sucked into our lungs (alveoli)
How is air sucked into our lungs (alveoli)? How is air pushed out of our lungs (alveoli)?

8. How to Ventilate

9. Why does the air move? BUT… Because your lungs don’t do heavy lifting…
You lungs are super lazy!
They get muscles to do the work.

10. Boyle’s Gas Law

11. Remember diffusion…
All molecules want to move from areas of _________ concentration to areas of _________ concentration.

12. How do we keep the concentration of gases higher so that they move into and out of the blood?

13. Inspiration (inhalation) creates lower pressure inside the lungs
Inspiration (inhalation) creates lower pressure inside the lungs. Expiration (exhalation) creates higher pressure inside the lungs.

14. The Ribs and the Diaphragm

15. http://droualb. faculty. mjc

16. Ventilation and Gas Exchange