1. Animal and Plant Gas Exchange How animals and plants get the gases they need

2.  ANIMAL SYSTEMS There’s two types of respiration that animals do. One is breathing, the other is cellular. Plants do the cellular one, but not the breathing one.

3. What’s the diff??  Internal Respiration  AKA cellular respiration!  Mitochondria  O2 is converted into CO2  Glucose is converted into ATP  This happens in the cells!

4. What’s the diff??  External Respiration  Breathing in and out  O2 is sucked in by the nose and mouth  O2 travels to lungs where the blood trades it for CO2  CO2 is breathed out as a waste from Cellular Respiration!

5. Structures of Respiratory System  Nose and Mouth  Breathe in and out  Trachea  Air flow travels through this tube  Lungs  Alveoli (air sacs) are the sight of gas exchange

6. Breathing

7. So what’s the point?  Function:  To breathe in O2 (for cellular respiration)  To exchange O2 for CO2  To get rid of (breathe out) CO2  SO…. We do external respiration (breathing) to have reactant gas (O2) for internal respiration (cellular respiration) and to get rid of the waste product (CO2)

8. How does gas exchange work in Respiratory System?  Tiny blood vessels called capillaries bring blood around the alveoli sacs to exchange gases

9. What do we need to breathe for?  OXYGEN intake!  CARBON DIOXIDE removal!  We have to breathe so that we can do cellular respiration!!!!  What happens to the CO2 we get rid of???  THINK…PLANTS duh!

10. RECAP

11. Questions  What is the difference between the respirations?  Why do we need to have Oxygen?  What happens to the CO2 we breathe out?  What structures actually do the gas exchange?  AND THE BIG QUESTION…  Do you think plants have a way to do gas exchange?  Do you think it works the same way??

12. Plant System Gas Exchange  PLANTS DON’T BREATHE!!!!  They do cellular respiration, but not the lung one!  They need to have a way to get CO2 and get rid of O2  The Answer??  A LEAF!!

13. What’s in a Leaf?  Leaf cross section

14. What’s in a Leaf?  Instead of a mouth for breathing, leaves have stomata  Pores in the underside of the leaf for gas to flow in and out  Also for water to leave!

15. Stomata  Also called stoma  Holes in the leaf  Guarded by cells that control how wide the pore is (Guard Cells)  Important for gas movement  AND WATER loss!

16. Transpiration  Plant sweating  On wet days, the cells are swollen with water and they bend, opening the stomata pore  On dry days, they are thin and straight, closing off the stomata pore

17. But why would it ever close?  Plants lose too much water if they stay open  But they don’t get enough CO2 in if they’re closed….hmmm  So when would be a good time for them to be closed?

18. How does gas travel in a plant?  Travels through the spongy mesophyll to get to the palisade mesophyll (where photosynthesis occurs)

19. So what’s the point?  Why do plants need CO2?  Why do they need to get rid of O2?  What happens to the O2?  What else is ‘leafing’ out of the plant besides O2?

20. Gas Travel  So the respiratory system in animals is for gas exchange….  How does this compare to the plant system?  What do these both need gas for?

21. A COMPARISON  Explain how the respiratory system in animals is comparable to the gas exchange system in plants.  Make sure you look at structures, functions, importance.  Work as a group.