1. CELLULAR RESPIRATION
Essential Question: How does the mitochondria break down glucose and convert it into energy the cell can use (ATP)?

2. In the last chapter green plants used ________________ to
AUTOTROPHS
___________ use energy from sunlight or chemicals to make their own food
In the last chapter green plants
used ________________ to
trap energy from __________
and make ______________
PHOTOSYNTHESIS
sunlight
food (glucose)

3. Cellular Respiration
Recall…Energy stored in glucose cannot be used by the cell
Cellular Respiration converts glucose into ATP

4. What kind of organisms do this?
animals
plants
bacteria
fungi
ALL LIVING THINGS NEED ATP!

5. PHOTOSYNTHESIS CELLULAR RESPIRATION
Quick Overview Video
PHOTOSYNTHESIS
___________ + _________ + ___________ →_______________ + __________
6 CO2
6 H2O
C6H12O6
6O2
CELLULAR RESPIRATION
C6H12O6
6 CO2
_____________ + _________ →________ + __________ + __________
6O2
6 H2O
The two equations are exact opposites!

6. energy from FOOD (glucose) to make _____ = ________________
This process of releasing the
energy from FOOD (glucose) to make _____ = ________________
ATP
CELLULAR RESPIRATION
 Image by Riedell Image from:

7. Cellular Respiration takes place in the mitchondria

8. 3 steps for Cellular Respiration
1) Glycolysis 2) Krebs Cycle (Citric Acid Cycle) 3) Electron Transport Chain (ETC)

9. 1) Glycolysis Occurs in the cytoplasm
2ATPs are used to split glucose is in half into 2 pyruvic acids & some ENERGY is released.
NADH is produced (Shuttled directly to Electron Transport Chain)
4 ATP are produced, but need 2 to get process started = 2 NET ATP

10. Using the diagram, walk your partner through the steps of glycolysis
Turn to a Partner
Using the diagram, walk your partner through the steps of glycolysis
What are the products of glycolysis? (3)

11. Where Pyruvic Acid goes depends on whether or not oxygen is present
NO Oxygen Present
Oxygen Present
Stays in cytoplasm: Fermentation
Travels to mitochondria:
Aerobic Respiration

12. The 2 NADH produced in glycolysis are shuttled directly over to the Electron Transport Chain

13. 2) Krebs Cycle (AKA Citric Acid Cycle) Oxygen MUST be present
Occurs in the mitochondrial matrix (interior space of mitochondria).

14. 2) Krebs Cycle
1. Pyruvic acid enters the mitochondria and is converted to citric acid. Citric acid enters the Krebs Cycle
Mitochondria
Citric Acid

15. 2) Krebs Cycle
2. Energy molecules (NADH and FADH2) are produced to carry electrons to the electron transport chain.

16. 2) Krebs Cycle
3. CO2 is released as waste; breathed out when you exhale 2 ATPs are produced during the Kreb’s Cycle

17. NADH & FADH2 Continue to the Electron Transport Chain

18. Turn to a Partner What are the products of the Krebs Cycle? (4)
Using the diagram, walk your partner through the steps of the Krebs cycle
What are the products of the Krebs Cycle? (4)
Which continue to the electron transport chain?
# of ATPs produced?

19. 3) Electron Transport Chain (ETC)
Occurs in the cristae (inner folds of the mitochondria)

20. 3) Electron Transport Chain (ETC)
1. NADH & FADH2 enter the cristae.

21. 3) Electron Transport Chain (ETC)
2. They lose their hydrogens (H+) and electrons (e-) are shuttled through the ETC.

22. 3) Electron Transport Chain (ETC)
3. Electrons are accepted by oxygen and combines with H+, forming water that is released into the cell
Released

23. 3) Electron Transport Chain (ETC)
4. H+ builds up inside the cristae and is passed through transport protein (ATP synthase) adding ADP and P to form ATP.

24. ETC continued… ETC Produce 32 - 34 ATP
NOTE: 2 ATP are used by transport proteins to move NADH from glycolysis into the ETC.
This results in a Net Gain of 32 ATP from the ETC.

25. Turn to a Partner…Explain the ETC
What are the products of the ETC? (2)

26. Cellular Respiration Recap

27. What is the total # ATP from 1 molecule of glucose during cellular respiration?
36 ATP from Aerobic Respiration
(=with Oxygen)
38% of total energy in glucose is held in the bonds of ATP produced
62% released as heat

28. Word Bank: H2O NADH & FADH2 Krebs Cycle 2 Glucose Pyruvic Acid O2 ETC
Mitochondria
NADH &
FADH2
Krebs Cycle 2
Glucose
Pyruvic Acid O2
ETC
Cristae
Glycolysis 32
Matrix
Cytoplasm
NADH
Reactant?
Product?
Product?
Reactant?

29. What happens if cells do not receive enough oxygen?

30. Cornell Summary