ANAEROBIC = NO OXYGEN!!

• Some cells may go their entire life without oxygen.

• Some cells can function for a little while without oxygen.

But they still need ENERGY!!

Fermentation

Two types offermentation: - alcoholic - lactic acid

Fermentation is a form of anaerobic cellular respiration. •It does not require oxygen.•A small amount of ATP will be made.

Fermentation occurs when oxygen is not available.

02+ C6H12O6 6CO2 + 6H2O + ATP + alcohol

or lactic acid

OCCURS IN THE CYTOPLASM OF CELLS

Summary Of Fermentation

Glycolysis Fermentation

Alcoholic Fermentation

Used in: - making bread dough rise (from CO2) - making beer and alcohol

Occurs in: - yeast - a few other microorganisms

Lactic Acid Fermentation

Occurs in: - unicellular organisms - human muscles

Used in making: - cheese - sour cream - yogurt - pickles - buttermilk - sauerkraut

• Your body must supply its working muscles with oxygen. – When oxygen is present, glucose can be broken down into

carbon dioxide, water, and ATP.• But – after 90 seconds of exercise, the oxygen is scarce!

– Cellular respiration continues at a very slow pace– The body must produce ATP in the absence of oxygen!

When We Exercise…

C6H12O6 CO2 + Lactic Acid (burns!!) + 2 ATP (energy)

•Lactic Acid Fermentation Begins!–Lactic Acid Fermentation produces ATP from glucose without oxygen – it also produces Lactic Acid, which builds up and BURNS!

After 15-20 minutes your bodies carbohydrate stores are gone, and

fat burning begins!

Energy Yield without oxygen

Glycolysis 2 ATP Fermentation+ 2 NADH

2 ATP TOTAL(that’s 34 less ATP than aerobic

respiration)

Advantage of Aerobic Respiration

Yields 66% more energy

36 net ATPThat’s nearly 20 times more ATP than

glycolysis alone.