Transcript Fermentation

Most organisms undergo cellular
respiration to produce energy.
However when there is an absence of
oxygen, an organism will go through
a process called fermentation.
Fermentation does not create glucose,
however it does allow glycolysis to
continue so that ATP is produced.
There are two types of fermentation:
Lactic Acid Fermentation and Alcohol
Fermentation.
Lactic Acid Fermentation
This process occurs in your muscle
cells. The build up of lactic acid is
what causes muscles to “burn”
during exercise.
What happens?
The cells undergo glycolysis to break
down glucose into 2 pyruvates. In this
process, 2 ATP and 2 NADHs are
formed.
 Two NADH molecules provide energy to
convert pyruvate into lactic acid. As the
NADH is used, it is converted back into
NAD+.
 Two molecules of NAD+ are recycled
back to glycolysis, so that NADH can be
reformed.

Alcoholic Fermentation

Occurs in yeast and some plants.
What happens?
The cells undergo glycolysis to break down
glucose into 2 pyruvates. In this process, 2
ATP and 2 NADHs are formed.
 Two NADH molecules provide energy to
break down pyruvate into an alcohol and
carbon dioxide. As the NADH is used, it is
converted back into NAD+.
 Two molecules of NAD+ are recycled back
to glycolysis, so that NADH can be
reformed.
