Question

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Answer 1

Answer:

During heavy exercise when the supply of oxygen to our muscle cells is insufficient, food breakdown is by anaerobic respiration.

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Answer 2

Answer:

False

Explanation:

There is a build-up of lactic acid in the muscles during vigorous exercise. The lactic acid needs to be oxidised to carbon dioxide and water later. This causes an oxygen debt - known as excess post-exercise oxygen consumption (EPOC) - that needs to be 'repaid' after the exercise stops.