1. BELLWORK Why do we breathe? What do we breathe in?
What do we breathe out?

2. Cellular Respiration

3. INTRODUCTION All cells need energy to function.
Cellular Respiration is the process cells use to create energy.
It happens in the
mitochondria.

4. What happens before cellular respiration
1. Eating Food
The process of aerobic respiration must begin with a food source. Some organisms, like plants, manufacture their own food while others obtain it by feeding on other organisms.
2. Digestion
Before aerobic respiration can begin, larger and more complex food must be broken down into simpler compounds

5. C6H12O6 + O2 ---> H2O + CO2 + ENERGY
Cellular Respiration
The process of breaking down glucose, to form energy (in the presence of oxygen).
C6H12O6 + O2 ---> H2O + CO2 + ENERGY
Sugar Oxygen Water Carbon
Dioxide

6. Important Terms ATP – the energy molecule NADH – electron carrier
FADH2 – electron carrier

7. Cellular Respiration with oxygen

8. Step 1 GLYCOLYSIS
One glucose is broken in half, producing 2 molecules of pyruvic acid.
2 NADH and 2 ATP molecules formed.

10. Step 2 - Krebs Cycle Pyruvic acid is broken down into carbon dioxide.
Electrons are generated.
8 NADH, 2 FADH2 and 2 ATP result.

12. Step #3 - Electron Transport Chain
Electrons are used to make lots of ATP.
Water is made.
34 ATP result.

14. The main purpose: to convert glucose into energy!
Total
The main purpose: to convert glucose into energy!
For every 1 glucose molecule, 36 ATPs are made.

15. Cellular Respiration with oxygen

16. 1. Krebs Cycle (or Citric Acid Cycle)
With Oxygen
Without Oxygen
Fermentation
without oxygen
1. Krebs Cycle (or Citric Acid Cycle)
2. Electron Transport
Fermentation
Alcohol – sugar broken down into alcohol and CO2.
Lactic Acid

17. Fermentation - alcohol
Turns sugar into alcohol and carbon dioxide
Wine
Bread with yeast

18. Fermentation – lactic acid
When athletes use energy faster than their bodies intake oxygen, lactic acid builds up in their muscles (burning sensation).
Lactic Acid goes away in the presence of oxygen.

19. Interactive Respiration
Using the textbook (page 222), explain the 3 steps of cellular respiration:
Glycolysis
Krebs Cycle
Electron Transport Chain
Either draw a picture or explain what happens in your own words (include what enters the stage and what the net product is).

20. Review Go to page 232 in your textbook.
Read the section, “Comparing Photosynthesis with Cellular Respiration”.
Make a chart.