1. Cellular Respiration

2. Glycolysis Reminder Where does the glucose come from?
What are the products of glycolysis?
What is the net gain of ATP?
Is glycolysis anaerobic or aerobic?
After glycolysis, if there is oxygen …

3. 2nd Step = Krebs Cycle AKA Citric Acid Cycle
The Krebs Cycle is AEROBIC (with oxygen)
In the inner membrane (cristae) of the mitochondria.
Cristae is folded – why?
Aerobic respiration releases more energy than Anaerobic (glycolysis and fermentation).

4. 2nd Step = Krebs Cycle Process:
Each Pyruvic acid molecule from glycolysis enter the mitochondria and loses a molecule of CO2.
This resulting molecule is called acetyl coenzyme A (Acetyl CoA)  enters Krebs Cycle
Each acetyl CoA joins a 4-carbon acceptor molecule.
Reactions take place that produces 2 more molecules of CO2 and one molecule of ATP per Acetyl CoA
NADH and FADH2 actually trap most of the energy
***2 ATP Produced***
Goal: Trap high energy electrons for next phase
Goes in: Acetyl CoA
Comes out: CO2

6. 2nd Step = Krebs Cycle

7. 3rd Step = Electron Transport Chain
Inner membrane of mitochondria
NADH transfers e- from original glucose to an electron transport chain.
Electrons move from carrier to carrier
Electrons end up with an Oxygen at the end of the chain and combine with H+ = water!
-Each transfer releases a small amount of energy

8. Electron Transport chain
4. The released energy is used to move H+ across membrane. 5. H+ go through structures called ATP Synthases. 6. ATP synthase used energy from the flow of H+ to covert ADP to ATP 7. Can generate up to 34 ATP per glucose! MOST ATP IS GENERATED HERE!!!

9. 3rd Step = Electron Transport Chain

10. Summary

11. Cellular Respiration Summary

12. Respiration in Animals
*Gas exchange occurs in the lungs
*CO2 (the waste product of respiration) is exchanged for O2 to begin respiration again