The molecule that serves as the major source of readily available fuel for neurons and blood cells is .

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Glucose is the major source of readily available fuel for neurons and blood cells because it can be easily transported in the bloodstream and readily taken up and metabolized by these cells. While fats and acetyl CoA can also serve as sources of energy, they are not as readily available or easily transported as glucose. Cellulose, on the other hand, cannot be used as a fuel source by human cells as we lack the enzymes necessary to break it down.

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