Can you please clarify the concepts presented in this question (it is question #14): During strenuous physical exertion, muscle tissues switch from aerobic to anaerobic metabolism. The net products per glucose molecule under these conditions are: A. 4 ATP, 2 NADH, 2 lactic acid B. 4 ATP, 2 NADH, 2 pyruvate C. 2 ATP, 2 NAD+, 2 lactic acid D. 2 ATP, 2 NAD+, 2 pyruvate Ok, so I believe glycolysis and lactic acid fermentation are the only two pathways we should be concerned with. Glycolysis yields a net of 2 ATP, 2 NADH, and 2 pyruvate. Lactic acid fermentation utilized these 2 pyruvate and oxidizes the 2 NADH to 2 NAD+. However, don't we get ATP (2 ATP per glucose) via lactic acid fermentation? Shouldn't that be a total net of 4 ATP, 2 NAD+, 2 lactic acid? Thanks for your help.