Given below are two statements regarding anaerobic respiration in the muscles. Statement (I): In muscles, NADH+H ^+ produced during glycolysis is reoxidised to NAD. Statement (II): One proton and two electrons produced, which are donated to pyruvic acid which yields lactic acid leading to muscle fatigue. In light of the above statements, choose the most appropriate answer from the options given below.

Step-by-step solution

Statement (I) is correct because during anaerobic respiration in muscle cells (lactic acid fermentation), the NADH + H ^+ produced during glycolysis is reoxidised to NAD ^+ to ensure a continuous supply of NAD ^+ for glycolysis to proceed. Statement (II) is incorrect because during the reduction of pyruvic acid to lactic acid, NADH + H ^+ donates two protons ( 2 H ^+ ) and two electrons ( 2 e ^- ) to pyruvic acid, not one proton and two electrons. The reaction is catalysed by lactate dehydrogenase. Answer: Statemen