Cell Respiration

How do we get energy from food?Cell Respiration – mitochondria break down

food to make ATP (energy)

Formula:C6H12O6 + 6O2 -----> 6CO2 + 6H20 + energy (heat and ATP)

1 glucose + 6 oxygen 6 carbon dioxide + 6 water + energy

3 Stages of Cell Respiration

1.2. 3.

3 Stages of Cell Respiration:1. Glycolysis

• Anaerobic – no oxygen required• Occurs in the cytoplasm• Glucose 2 pyruvic acids*• Net ATP production = 2

3 Stages of Cell Respiration:

2. Citric Acid Cycle (a.k.a. Krebs Cycle)• Occurs in mitochondria, requires oxygen

(aerobic)• Net ATP production = 2

3 Stages of Cell Respiration:3. Electron Transport Chain

• Occurs in mitochondria, requires oxygen (aerobic)

• Net ATP = 32

Electron Transport Chain Animation

* If oxygen is not available, cell undergoes fermentation after glycolysis.

2 Types of Fermentation

2 Types of Fermentation:

1. Lactic Acid – lactic acid builds up in muscles when they do no get enough oxygen muscle fatigue

Other Products?

2 Types of Fermentation:

2. Alcoholic – yeast cells produce CO2 and ethyl alcohol (a.k.a. ethanol).

Other Products?

Aerobic vs. Anaerobic

AEROBIC CONDITIONS:

(oxygen present)

Cell Respiration

36 ATP

ANAEROBIC CONDITIONS:

(no oxygen)

Fermentation

2 ATP

Which is more efficient (which produces MORE energy)?