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Anaerobic Respiration
Chapter 10.3
Important Molecules in anaerobic
respiration
CO2: One of two products formed in
alcoholic fermentation
 Ethanol/ Ethyl Alcohol: One of two
products formed in alcoholic
fermentation
 Lactic Acid/ Lactate: Product of lactic
acid fermentation
 Pyruvic Acid: Product of Glycolysis
(2 per glucose molecule)

Glycolysis

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
sensation.
 The body’s natural response is pain. In
an effort to stop the exercise and take in
oxygen.

Oxygen Debt
The amount of oxygen needed to convert
that lactic acid build up back into pyruvic
acid.
 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
