1. Cellular Respiration Do animals breath?
How do animals get their energy?

2. Cellular Respiration Equation
C6H12O6 + 6O2  6CO2 + 6H2O + cell energy (ATP)
In words…..
Glucose + oxygen  carbon dioxide + water + energy

3. 2. All Cells perform cellular respiration to get energy/ATP
Cells and Energy – Cellular Respiration
The process called cellular respiration releases the energy in carbohydrates in two steps.
Glycolysis
Krebs Cycle
2. All Cells perform cellular respiration to get energy/ATP

4. Step 1: Glycolysis glyco – sugar lysis – to break down
Glycolysis occurs in the cell’s cytoplasm.
One glucose molecule breaks into 2 smaller molecules called pyruvate and also makes 2 ATP molecules

5. Step 2a: Krebs Cycle (Oxidative Respiration)
**Only if Oxygen is present
occurs in the mitochondria
The products from Glycolysis go through aerobic respiration.
In this process pyruvate is turned into Acetyl CoA to begin the Krebs Cycle
The Krebs cycle produces 34 ATP molecules!!

7. Step 2b: Fermentation Only if oxygen is NOT present.
2 types of fermentation:
Alcoholic fermentation:
EX: In yeasts it produces alcohol and carbon dioxide.
It causes bread dough to rise. Another example is grapesalcohol.
Lactic Acid fermentation
Occurs in muscle cells,
The pyruvic acid accumulates as a result of glycolysis producing lactic acid, which makes muscles sore.