by 
kuyakev
ANSWERS: 2
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I don't know exactly the answer to your question, but I would guess that as brain activity decreases or increases, so does the level of glucose consumption. Therefore, there would be no absolute glucose intake. I do know, thanks to http://fi.edu/learn/brain/carbs.html#brainenergy, that the neuron transmission in your brain takes up approximately 10% of your body's entire energy levels.
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4 grams of glucose required by the brain per hour. Brain cannot use protein or fat directly. If the blood glucose level is higher than 70mgm/dl, to any level even 500mg/deci.litre the brain will get glucose automatically and live safetly. If the glucose level drops less than 70mg/dl, confusion starts and the brain will die if the glucose level drops below 20 mg/dl. ref:http://www.medbio.info or http://www.biomedu.com/
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