1. Lesson Overview Lesson Overview Cellular Respiration: An Overview Cellular Respiration Cellular Respiration -Explain where organisms get the energy they need for life processes. -Define cellular respiration. -Compare photosynthesis and cellular respiration.

2. Lesson Overview Lesson Overview Cellular Respiration: An Overview Chemical Energy and Food Food molecules contain chemical energy that is released when its chemical bonds are broken during a process called CELLULAR RESPIRATION.

3. Lesson Overview Lesson Overview Cellular Respiration: An Overview What is a Calorie? Energy stored in food is expressed in units called calories. A Calorie is the amount of energy needed to raise the temperature of 1 gram of water by 1 degree Celsius.

4. Lesson Overview Lesson Overview Cellular Respiration: An Overview Overview of Cellular Respiration If oxygen is available, organisms can obtain energy from food by a process called cellular respiration. Equation: 6 O 2 + C 6 H 12 O 6  6 CO 2 + 6 H 2 O + Energy In words: Oxygen + Glucose  Carbon dioxide + Water + Energy

5. Lesson Overview Lesson Overview Cellular Respiration: An Overview Stages of Cellular Respiration The three main stages of cellular respiration are: 1. Glycolysis 2. Krebs cycle 3. The electron transport chain

6. Lesson Overview Lesson Overview Cellular Respiration: An Overview Stage 1: Glycolysis Glycolysis is anaerobic and produces only a small amount of energy. *2 ATP molecules*

7. Lesson Overview Lesson Overview Cellular Respiration: An Overview Stage 2: Krebs Cycle During the Krebs cycle, a little more energy is generated using pyruvic acid to power the Electron Transport Chain. *2 ATP molecules*

8. Lesson Overview Lesson Overview Cellular Respiration: An Overview Stage 3: The Electron Transport Chain The electron transport chain produces the bulk of the energy in cellular respiration by using oxygen. *32 net ATP molecules*

9. Lesson Overview Lesson Overview Cellular Respiration: An Overview Aerobic vs Anaerobic Aerobic = with oxygen Anaerobic = without oxygen

10. Lesson Overview Lesson Overview Cellular Respiration: An Overview Photosynthesis and Cellular Respiration Photosynthesis and cellular respiration are opposite processes. The energy flows in opposite directions.