As skeletal muscle cells enter anaerobiosis during vigorous exercise, the human body will boost its catabolism of fat exclusively.
The Krebs cycle, which involves the sequential breakdown of pyruvic acid and lactic acid to produce ATP and CO2, is where complete oxidation of food occurs.
Muscle cells turn pyruvate to lactate when they are depleted of oxygen after a strenuous exercise session. How is lactate handled by skeletal muscle cells? It is transported to the liver where it is changed back to pyruvate. The heart continues to beat even when skeletal muscle cells are oxygen-deficient.
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