Cellular Respiration

By Courtney Gates

Definition• Cellular respiration is the process by

which mitochondria break down food molecules to produce ATP

• Equation: C₆H₁₂O₆+6O₂→ 6CO₂+6H₂O

Stages• Three stages of cellular respiration:

1. Glycolysis2. Krebs Cycle3. Electron Transport Chain

Glycolysis• Glycolysis is a series of

chemical reactions in the cytoplasm of a cell that break down glucose into two molecules of pyruvic acid and a three-carbon compound

• Two ATP are used• Two ATP are produced

and NADH carries electrons

Oxidation of Pyruvate

• Before the Krebs cycle pyruvic acid undergoes a series of chemical reactions

• It gives off CO₂• It combines with

coenzyme A to form acetyl-CoA

Krebs Cycle• Is also known as

the Citric Acid Cycle• Is a series of

chemical reactions and for every turn of the cycle two ATP’s, two CO₂ molecules, and NADH and FADH₂ are produced

Electron Transport Chain

• NADH and FADH₂ give up electrons that pass through a series of chemical reactions

• Oxygen is the final electron acceptor which ends up producing water

• Produces 32 ATP

ATP Produced• 4 ATP molecules

are produced from the Krebs Cycle (2 from each pyruvate)

• 32 ATP molecules are produced from the Electron Transport Chain

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• Time to find out what you have learned about cellular respiration

• Trivia game• Practice test