1. Cellular Respiration

2. Objectives To understand where cell respiration takes place.
To learn the key molecules in respiration
To understand the process from which cells obtain their energy
To identify and understand the concepts of aerobic and anaerobic

3. Can we photosynthesize?
How do we obtain energy?
But how do we turn food into energy?

4. Cellular Respiration
Process that breaks down food molecules to produce ATP
Takes place in Mitochondria

5. ATP ADP resists addition of 3rd phosphate
Large excess of energy released when ATP releases phosphate to become ADP

6. Stages of Cell Respiration
Glycolysis
Citric Acid Cycle
Electron Transport Chain

7. Glycolysis
Series of reactions in cytoplasm that break down glucose (6 carbon sugar)
Creates two pyruvic acids (3 carbon)
Anaerobic- no oxygen required
Occurs OUTSIDE the mitochondria!

8. Glycolysis Continued NAD+ used as electron carrier to ETC
Uses up two ATP
Produces four ATP
Net gain of two ATP

9. Citric Acid Cycle (CAC)
Pyruvic Acid (from glycolysis) loses CO2 combines with enzyme A
This forms Acetyl CoA
Starting Point of CAC

10. Citric Acid Cycle Cont. One ATP produced for every turn
Takes place in Mitochondria
NAD+, FAD used as electron carriers to ETC
Aerobic – oxygen required

11. Electron Transport Chain
NADH, FADH2 provide energized electrons
Electrons passed on through series of proteins
Final acceptor is oxygen
This creates H2O
PRODUCES 32 ATP

12. Write this in words as well!
EQUATION
C6H12O6 + 6O2= 6CO2+6H2O+ATP
Write this in words as well!
Pssssst………. Know this!!

13. Overall Glycolysis- anaerobic Citric Acid Cycle- aerobic
Electron Transport Chain- aerobic
NET PRODUCTION OF 36 ATP

14. Lactic Acid Fermentation
No Oxygen
Replaces NAD+ in lack of oxygen
So ETC may continue
Lactic acid builds up in muscles

15. Alcohol Fermentation Produces CO2 and Ethanol
Example- Yeast in bread making

16. Take Home Point
Photosynthesis and Cellular Respiration are interdependent on each other.
The reactants of photosynthesis are the products from cell respiration
The reactants of cell respiration are the products from photosynthesis