Fermentation allows the production of a small
amount of ATP without oxygen.
Think about how your body feels during exercise….
Arms and legs feel heavy
You lose strength
Breathing rate increases
Your muscles are using
• The cells in your body cannot store large amounts of
oxygen for cellular respiration
• Breathing normal will provide you with enough oxygen for
your regular activities
• When you are doing high levels of activity your body
cannot bring in enough oxygen for your cells even though
you breathe faster
How do your cells function without enough oxygen to
keep cellular respiration going?
• Your body will continue by using glycolysis and
• Fermentation allows glycolysis to continue making ATP
when oxygen is unavailable.
• anaerobic process.
– occurs when oxygen is not available for cellular
– does not produce ATP
• Lactic acid fermentation occurs in muscle cells when
oxygen is unavailable.
– Causes muscles to “burn”
– Waste product of fermentation
– Once oxygen is available, cells go back to using cellular
• Alcoholic fermentation is similar to lactic acid
– glycolysis splits glucose and the products enter
– energy from NADH is used to split pyruvate into an
alcohol and carbon dioxide
– NADH is changed back into NAD+
– NAD+ is recycled to glycolysis
• Fermentation is used in food production.