anaerobic respiration

• The Krebs cycle and the electron transfer chain cant take place so pyruvate builds up in the cell. 
• NADH reacts with pyruvate to produce NAD and lactate. 
• If NAD wasn’t regenerated, glycolysis would stop because there would be no NAD available to accept electrons and protons in glycolysis. 
• If lactate accumulates in muscles it lowers the pH. The lactate is removed to the liver and converted to glycogen because build ups of lactate causes muscle cramps. 
• In plants pyruvate loses a molecule of CO2, the pyruvate also accepts hydrogen from reduced NAD to produce ethanol.