In animal cells, like muscles during exercise, when oxygen is inadequate for cellular respiration pyruvic acid is reduced to lactic acid by

Lactate decarboxylase

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Pyruvate dehydrogenase

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Lactate dehydrogenase

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Both A and B

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Solution

The correct option is C Lactate dehydrogenase
Lactic Acid fermentation in muscle cells
During strenuous exercise, our muscles demand high energy. But there is insufficient oxygen available in the muscle cells at that moment.
So the pyruvate molecules break down anaerobically to form Lactic acid to obtain instant energy. This process is catalysed by lactate dehydrogenase.
Final answer:
(d) Lactate dehydrogenase

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(a) Alcohol and lactic acid
(b) Alcohol and $C O_{2}$
(c) Lactic acid and $C O_{2}$
(d) Lactic acid only

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Respiration

Standard VII Biology

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