Anaerobic respiration

• Anaerobic respiration happens when there is not enough oxygen for aerobic respiration.
• glucose $\rightarrow$ lactic acid
• anaerobic respiration happens in the cytoplasm of cells, mostly muscle cells
• lactic acid produced in anaerobic respiration causes muscle cramp
• anaerobic respiration transfers less energy per glucose molecule than aerobic respiration
• when you exercise you breathe heavily. the extra oxygen you inhale breaks down the lactic acid. the oxygen needed for this is called oxygen debt.
• fermentation is when some plants and microorganisms produce ethanol and carbon dioxide instead of lactic acid. its a type of anaerobic respiration as they respire without oxygen
• fermentation:

  glucose $\rightarrow$ ethanol + carbon dioxide
• C6H1206 —> CH3CHOH + CO2
• Enzymes in yeast speed up fermentation, making the reaction faster. it works best in a warm enviroment
• HOW DO YOU MAKE BREAD?

  • Flour, water and yeast are mixed
  • The dough rises in a warm place
  • Yeast changes the sugars (in flour) into ethanol and carbon dioxide
  • Co2 is trapped inside, making bread rise
  • Ethanol evaporates when bread is baked
• beer - sugars in barley is fermented by yeast

  wine - sugars in grapes is fermented by yeast