Chapter 7.6 Summary

Some cells can harvest energy without oxygen

• When you sprint, lungs and bloodstream can't supply oxygen fast enough to make ATP
  Instead, muscle cells use fermentation
• Fermentation: making ATP without oxygen
• While cellular respiration still continues, fermentation is main source of ATP
• Fermentation makes ATP from glycolysis
• Yields 2 ATP per glucose molecule
• Fermentation produces lactic acid
• Build up of lactic acid contributes to fatigue after exercise
• Yeast also ferments of sugar and other foods
• Instead of lactic acid, produces alcohol
• Fermentation of fungi and bacteria turn milk into cheese; soybeans into soy sauce; cabbage into sauerkraut

Concept Check 7.6


1) How is fermentation different from cellular respiration?


Fermentation produces ATP without oxygen and only produces 2 ATP per glucose molecule.


2) Describe one example of how fermentation in microorganisms produces human foods


The fermentation of fungi and bacteria is how milk is turned into cheese.


3) What is the waste product of fermentation in your muscle cells?


The waste product of fermentation in our muscle cells is lactic acid.