Fermentation When cells do not have enough oxygen for respiration, they use a process called fermentation!

Yeast Cells Yeast are one celled organisms They break down sugar into bread dough (you may have used them in the silver packets that look like this

Yeast rolls They produce alcohol and carbon dioxide wastes The CO2 is the gas that makes the bread rise before you bake it The alcohol is lost as you bake the bread

Muscles Cells Your muscle cells use fermentation to change the simple molecules into lactic acid while releasing energy Fermentation begins in the cytoplasm. As the glucose molecules are broken down, energy is released

BUT the simple molecules from the breakdown of glucose do not move into the mitochondria Instead, more chemical reactions occur right in the cytoplasm! These reactions release some energy BUT produce wastes!

Depending on the type of cell- it changes to lactic acid or carbon dioxide When you have lactic acid present in your muscles- you feel sore

How to get rid of the lactic acid Massage! Brisk Walking