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In case of repeated contraction, muscle cells regenerate NAD⁺ by converting pyruvate to _____________

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In case of repeated contraction, muscle cells regenerate NAD⁺ by converting pyruvate to _____________

(a) glycogen

(b) lactate

(c) starch

(d) cellulose

I have been asked this question in an interview for internship.

My question is taken from Metabolism topic in portion Bioenergetics, Enzymes, Metabolism, Genes, Chromosomes and Genomes of Cell Biology

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The correct answer is (b) lactate

Explanation: In case of repeated contraction, the oxygen levels drop down and make it difficult to keep up with the cell’s metabolic demands. Under these conditions, skeletal muscle cells regenerate NAD⁺ by converting pyruvate to lactate.

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