PHYSIOLOGY
MUSCLE ENERGETICS GLYCOLYSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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oxygen is not present
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oxygen is present
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when glucose split into two pyruvate molecules
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none of the above
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Detailed explanation-1: -When oxygen is not present, pyruvate will undergo a process called fermentation. In the process of fermentation the NADH + H+ from glycolysis will be recycled back to NAD+ so that glycolysis can continue.
Detailed explanation-2: -The process of fermentation results in the reduction of pyruvate to form lactic acid and the oxidation of NADH to form NAD + . Electrons from NADH and a proton are used to reduce pyruvate into lactate.
Detailed explanation-3: -In the presence of oxygen, pyruvate is transformed into an acetyl group attached to a carrier molecule of coenzyme A. The resulting acetyl CoA can enter several pathways, but most often, the acetyl group is delivered to the citric acid cycle for further catabolism.