What happens when pyruvate is converted to lactate?

Conversion of pyruvate to lactate during redox reaction oxidizes NADH to NAD+

Explanation:

Pyruvate is converted to lactate by the enzyme lactate dehydrogenase under anaerobic condition.

Conversion of pyruvate to lactate during redox reaction oxidizes NADH to NAD+ . This is because every glucose molecule that will be converted into pyruvate, two NADH molecules are produced and there is need for the NADH molecules to be oxidised back to NAD+ to ensure the continuity and maintenance of glycolysis.