Question

Muscle cells in oxygen deprivation convert pyruvate to ________, and in this step gain ________. lactate; atp alcohol; co2 alcohol; atp atp; nadh2 lactate; nad+

Answer 1

Answer; 
Muscle cells in oxygen deprivation convert pyruvate to lactate, and in this step gain NAD+.

Explanation; 
When oxygen is insufficient or not present the muscle cells for further oxidation of pyruvate and NADH produced in glycolysis, NAD+ is regenerated from NADH by reduction of pyruvate to lactate.
Pyruvate is converted to lactate by the enzyme lactate dehydrogenase.