KEY CONCEPT The overall process of cellular respiration converts sugar into ATP using oxygen.

1. KEY CONCEPT The overall process of cellular respiration converts sugar into ATP using oxygen.

2. Glycolysismust take place first. It happens in the cell’s cytoplasm • anaerobic process (does not require oxygen) • splits glucose (from photosynthesis) into two three-carbon molecules called pyruvates • produces two ATP molecules 2 pyruvate “Sweet Split” ATP

3. Cellular respiration releases chemical energy from sugars (produced by photosynthesis) and other carbon-based molecules to make ATP when oxygen is present • Cellular respiration is aerobic, or requires oxygen. O2

4. Cellular respiration takes place in mitochondria “the powerhouse of the cell”

5. 1 ATP mitochondrion matrix (area enclosed by inner membrane) and 6CO 2 energy 2 3 energy from glycolysis ATP inner membrane and and 6H O 6O 2 2 4 • The Krebs cycle takes place inthe mitochondrial matrix • 2 pyruvates (3 carbon molecules) enter cellular respiration Krebs Cycle • Pyruvates are broken down and ATP is made during the Kreb’s Cycle • ATP (energy) is transfers energy-carrying molecules to the electron transport chain • releases carbon dioxide

6. 1 ATP mitochondrion matrix (area enclosed by inner membrane) and 6CO 2 energy 2 Electron Transport 3 energy from glycolysis ATP inner membrane and and 6H O 6O 2 2 4 • The electron transport chain produces a large amount of ATP and takes place in the inner membrane • 3. energy transferred to electron transport chain • oxygen enters process and is used to make H2O • 4. A large number of ATP molecules are produced • water and heat are released

7. Cellular Respiration …..Reactants….. …..Products…..

8. Cellular Respiration Sugars (2 pyruvates) O2 …..Reactants….. Energy is transferred to the E.T. C. Energy transferred into inner membrane of mito The Kreb’s Cycle breaks down pyruvates into ATP A large # of ATP is made. O2 is used to make H2O Stage 2 Stage 1 H2O CO2 Heat …..Products…..

9. Try and hold your breath for as long as you can (no cheating). How did you feel as you were holding your breath? Why do you think you felt this way? If you were to run a few miles, what would happen to your breathing?

10. How does your body use oxygen? • Oxygen helps your body break down chemical energy that is stored in sugars and other carbon based molecules. • The energy produced is ATP ATP

11. Cellular respiration is like a mirror image of photosynthesis.

12. Cellular Respiration Photosynthesis

13. Reactants Light Energy CO2 H2O Reactants Sugars O2 Cellular Respiration Photosynthesis Products Glucose (sugar) O2 Products Glucose (sugar) O2

14. The equation for the overall process is: C6H12O6 + 6O2  6CO2 + 6H2O • The reactants in photosynthesis are the same as the products of cellular respiration.

15. Plants use photosynthesis to make their own food • Animals eats other organisms as food • Food is not the direct source of energy • Instead we break down molecules from food to produce ATP • Cellular respiration releases chemical energy from sugars (produced by photosynthesis) and other carbon-based molecules to make ATP when oxygen is present

18. Sunlight • Please make a diagram showing the relationship between Photosynthesis and Cellular Respiration • chloroplast • Mitochondria • An animal • a plant • all products • label photosynthesis and cellular respiration • Show the arrows of the cycle Photosynthesis CO2 Sugar O2 H2O Cellular Respiration ATP

19. Points to Ponder • What is the difference between aerobic and anaerobic processes? • In what organelle does cellular respiration take place? • How does our body use oxygen?

20. What is the difference between aerobic and anaerobic processes? • Aerobic needs oxygen • Anaerobic does not need oxygen • In what organelle does cellular respiration take place? • mitochondria • How does our body use oxygen? • Oxygen helps your body break down chemical energy that is stored in sugars and other carbon based molecules.