1. Cellular Respiration
Chapter 8 Section 3 Notes

2. Cellular Respiration: You get your energy this way!

3. Overview of Cellular Respiration
C6H12O6 + 6O2  6CO2 + 6H2O + Energy
Cellular Respiration occurs in 2 parts:
An anaerobic process—does not require oxygen
An aerobic process—requires oxgyen
Glycolysis
Krebs Cycle & Electron Transport

4. Overview of Cellular Respiration
Cellular respiration: a set of the metabolic reactions that take place in the mitochondria of cells to convert sugars/other nutrients into ATP and waste products (CO2).

5. Glycolysis is anaerobic  doesn’t require oxygen
Aerobic  requires oxygen

6. Use 2 ATP molecules to convert it into a smaller compound
Glycolysis
Glycolysis glucose broken down in the cytoplasm
Glycolysis produces 4 ATP but 2 are used to keep the process going, so it is actually a net of 2
NET PRODUCT:
2 ATP
Start with: 1 Glucose molecule
Use 2 ATP molecules to convert it into a smaller compound
End with: 2 Pyruvate molecules, 4 ATP molecules

7. Kreb’s cycle (aerobic respiration)
Kreb’s cycle, also called the Citric Acid Cycle, is the process in which pyruvate is broken down into carbon dioxide.
At the end of glycolysis, there are 2 ATP + 2 pyruvates
The pyruvate still has energy in it, so the Kreb’s Cycle breaks it down further to get it out to be used
Kreb’s cycle (aerobic respiration)
NET PRODUCT:
2 ATP

8. Glycolysis produces 2 pyruvates so they have to go through Kreb’s cycle twice to get all the energy out!

9. Kreb’s cycle = 6CO2 + 2 ATP + 8 NADH + 2 FADH2
The NADH & FADH2 molecules move on to next part

10. Electron Transport Chain
In aerobic respiration, e- transport is the final step in breakdown of glucose
Most of the ATP is produced at this point!
NET PRODUCT:
32 ATP

11. Total ATP from Cellular Respiration
The total ATP production for cellular respiration is 36 ATP (2 ATP from glycolysis, 2 ATP from Kreb’s cycle, 32 ATP from the electron transport chain)

12. Anaerobic Respiration
Many prokaryotes can live without oxygen!
This pathway to produce energy this way is called fermentation a process which occurs in cytoplasm and produces small amounts of ATP without the presence of oxygen
Anaerobic Respiration

13. Alcohol fermentation occurs in yeast & some bacteria, pyruvate converted to ethyl alcohol & carbon dioxide

14. Photosynthesis & Cellular Respiration
The products for photosynthesis are the reactants for cellular respiration and the products for cellular respiration are the reactants for photosynthesis, thus this is a continuous cycle.