Which of the following occurs as a result of fasting?Group of answer choicesketone bodies are exported from the liver for use in extrahepatic tissueketone bodies are used in the liver as fuelGNG stops to allow the liver cell to produce ketonesGlycolysis in the liver cell happens to a greater degree
Question
Which of the following occurs as a result of fasting?Group of answer choicesketone bodies are exported from the liver for use in extrahepatic tissueketone bodies are used in the liver as fuelGNG stops to allow the liver cell to produce ketonesGlycolysis in the liver cell happens to a greater degree
Solution
The correct answer is "ketone bodies are exported from the liver for use in extrahepatic tissue".
Here's why:
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During fasting, the body needs to find alternative energy sources because glucose levels are low.
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The liver starts to break down fatty acids to produce ketone bodies. This process is known as ketogenesis.
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These ketone bodies are then exported from the liver to other tissues (extrahepatic tissues) like the brain and muscle where they can be used as a fuel source.
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The liver itself does not use ketone bodies as fuel. Instead, it continues to use fatty acids for energy.
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Gluconeogenesis (GNG) does not stop during fasting. In fact, it is crucial during fasting as it helps to maintain blood glucose levels by generating glucose from non-carbohydrate sources.
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Glycolysis in the liver does not happen to a greater degree during fasting. Instead, it is reduced because of the low levels of glucose.
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