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Anaerobic Respiration
Chapter 10.3
Important Molecules in anaerobic
CO2: One of two products formed in
alcoholic fermentation
 Ethanol/ Ethyl Alcohol: One of two
products formed in alcoholic
 Lactic Acid/ Lactate: Product of lactic
acid fermentation
 Pyruvic Acid: Product of Glycolysis
(2 per glucose molecule)
As in aerobic respiration Glycolysis is the
first step. It will yield the only ATP
created in anaerobic respiration
Alcoholic Fermentation
glucose → 2 ethanol + 2 CO2 +2 ATP
 Occurs in many bacteria and Fungi
Lactic Acid Fermentation
glucose → 2 lactate + 2 ATP
Lactic Acid Burn
Runners burn when muscles are loaded
with lactic acid which causes a burning
 The body’s natural response is pain. In
an effort to stop the exercise and take in
Oxygen Debt
The amount of oxygen needed to convert
that lactic acid build up back into pyruvic
 This is why an athlete breathes heavy
after muscle cramps the body is
maintaining homeostasis by converting
lactic acid back to pyruvates for normal
respiration to resume.
Efficiency of Respiration
Aerobic Respiration is roughly 20x more
efficient than anaerobic respiration.
 Aerobic respiration produces: 38 ATP
 Anaerobic respiration produces: 2 ATP