In prolonged starvation the main nergy source of brain is_____________?
Correct answer: B. Ketone bodies
- A. Glucose
- B. Ketone bodies
- C. Fructose
- D. Fatty acids
Explanation
During prolonged starvation, the brain adapts to use ketone bodies made by the liver, greatly reducing its dependence on glucose. Fatty acids cannot cross the blood-brain barrier efficiently and therefore are not the brain's main fuel.
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