Answer :
Pyruvate undergoes a reduction reaction that yields lactate if oxygen is not present in the cell in sufficient amounts.
Pyruvate usage in anaerobic environments
We are left with two pyruvate molecules, which have three carbons, after glycolysis. Oxygen availability determines how pyruvate behaves. Pyruvate is transported into the mitochondria if oxygen is present, where it undergoes the "Citric Acid Cycle," a series of further metabolic processes. This process is referred to as aerobic metabolism. If the cell does not have access to enough oxygen, pyruvate undergoes a reduction process that yields lactate . Anaerobic metabolism is the term for this.
Using pyruvate aerobically
Pyruvate passes the mitochondrial membrane and is swiftly converted to Acetyl CoA when there is sufficient oxygen available to the cell. Acetyl CoA starts the citric acid cycle, where CoA is taken out and acetate is combined with a 4 carbon molecule to create a 6 carbon molecule known as "citric acid." Two more carbons are lost as CO2 throughout the subsequent biochemical steps of the citric acid cycle , and ultimately all of the pyruvate's carbons are lost as CO2. The original glucose molecule's carbons have all been liberated as CO2 after two pyruvates have completed the citric acid cycle.
Thus if there is not enough oxygen in the cell, pyruvate passes through a reduction reaction that produces lactate.
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