1. Cellular Respiration

2. Vocabulary Calorie Glycolysis Cellular respiration NAD+ Fermentation
Anaerobic
Aerobic
Krebs Cycle
Electron Transport Chain
Vocabulary

3. How do you feel when you are really hungry?

4. Chemical Energy and Food
Food provides organisms with energy
1 g of sugar = 3811 calories of heat energy
A calorie= amount of energy needed to raise the temperature of 1 gram of water, 1 degree Celsius
The Calorie on nutrition labels is a Kilocalorie
How do we covert food into energy?
Chemical Energy and Food

5. Process that releases energy by breaking down glucose and other food molecules in the presence of Oxygen.
Cellular respiration

6. Brainpop

7. Cellular respiration- 3 Main Stages
Glycolysis
Krebs Cycle
Electron Transport Chain
Cellular respiration- 3 Main Stages

8. #1
One molecule of glucose is broken in half, producing two molecules of pyruvic acid (a 3- Carbon compound)
Occurs in cytoplasm, requires some energy from cell
Net gain of 2 ATP molecules
Happens Fast
Requires no oxygen
Next step: Fermentation or Krebs Cycle
Glycolysis rap on youtube
Glycolysis

9. If No Oxygen is present…
#2a
FERMENTATION
Fermentation releases energy from food and makes ATP without oxygen= ANAEROBIC
2 types of fermentation—Alcoholic and Lactic Acid
If No Oxygen is present…

10. Alcoholic Fermentation
Yeasts and other microbes carry out alcoholic fermentation
Pyruvic acid + NADH  alcohol + CO2 + Nad+
Fermentation Demo
2g yeast, 2g sugar, 50ml water into a balloon. Tie balloon and wait a day or two.
Alcoholic Fermentation

11. Lactic Acid Fermentation
Used by organisms other than yeasts and microbes
Pyruvic acid + NADH - lactic acid + NAD+
Lactic Acid Fermentation

12. Lactic acid is produced in your muscles during rapid exercise (limited oxygen present!)
Your muscles quickly run out of oxygen when exercising strenuously
Lactic Acid is produced and builds up causing pain, fatigue
Lactic acid

13. Think of a time when you may have experienced Lactic Acid Fermentation!
Lactic Acid Video Clip

14. Krebs cycle—Oxygen PResent
If oxygen is present at the end of glycolysis, cellular respiration moves to the Krebs Cycle
With oxygen= AEROBIC
Pyruvic acid is broken down into carbon dioxide and energy!
High energy electrons are passed onto the Electron Transport Chain…
Krebs cycle—Oxygen PResent

15. Electron transport chain#3
Final step of Cellular Respiration
Uses the electrons produced in the Krebs Cycle to covert them into ADP and ATP.
LOTS of energy is created!
Electron transport chain

16. Glycolysis-2 ATP molecules
Krebs + Electron Transport Chain= 36 ATP molecules
Energy Totals

17. Wrap it up video review

18. Cellular Respiration FlowChart
Handout…tape into notes biology corner
Cellular Respiration FlowChart

19. Feel the burn Quick lab activity (from Dana)
Clothespin, open/close for 1 min, then 2. record # of times. When did you swtich from aerobic to anerobic?
Feel the burn