1. Bellringer Why do we eat? What is needed in order to make a fire burn?
Burning Fuel

2. Cellular Respiration
Chapter 2 Lesson 2

3. What Is Cellular Respiration?
All of our energy comes from food
Cellular respiration
The process by which cells break down food (glucose) and release energy
Living things need a constant supply of energy so they carry out cellular respiration continuously

4. What is Cellular Respiration?
Storing and Releasing Energy
When you eat you add to your body’s energy savings by storing glucose
When you need energy, your cells break down the glucose through cellular respiration
Breathing and Respiration
Respiration can mean breathing (moving oxygen into your lungs)
The oxygen is used to carry out cellular respiration

5. Mitochondria The powerhouse of the cell In the mitochondria
Small sugar molecules are broken down with oxygen releasing large amounts of energy
Cristae-folds where cellular respiration occurs

6. Cellular Respiration Stage 1 Glycolysis
Occurs in the cytoplasm
Glucose is broken down into smaller molecules WITHOUT oxygen releasing a small amount of energy

7. Cellular Respiration Stage 2 Krebs Cycle and Electron Transport
In the mitochondria
Small molecules are broken down in the presence of oxygen
This forms carbon dioxide, water, and large amounts of ATP
Chemical energy of the cell

8. The Cellular Respiration Equation

9. Comparing Two Energy Processes

10. Comparing Two Energy Processes

11. What Happens During Fermentation?
Process in which cells release energy from food without using oxygen
Without oxygen the products of cellular respiration are different
Alcoholic Fermentation
Ethyl alcohol is formed by yeast and some bacteria
Lactic Acid Fermentation
Lactic acid is formed by muscle cells when cellular respiration is done without oxygen