The graph illustrates the concentration of lactic acid in the blood both during exercise and while recovering after exercise. Blood lactic acid concentration / $\text{mg dm}^{-3}$ plotted against time / minutes. Which process is responsible for the shape of the graph at Z?
- Aaerobic respiration of lactic acid in the kidney
- Baerobic respiration of lactic acid in the liver
- Canaerobic respiration of lactic acid in the kidney
- Danaerobic respiration of lactic acid in the liver