General objective of this lecture is to present on Anaerobic Respirationin animals and Plants. In low oxygen conditions or during heavy exercise, when not enough oxygen can be supplied, muscle cells swap to anaerobic respiration. The same process occurs in plants and yeast in low oxygen conditions, e.g. muddy, flooded soils. During this time more oxygen is taken in to convert the lactic acid back into pyruvic acid again.The volume of oxygen needed is called the oxygen debt.