Figure 1.

Energy flow during increased demand. (A) Simplified account of capillary/glycogen/astrocyte relationship, modified from Brown (2004). (B) A schematic of our model, in which energy is treated as a single fluid flowing between compartments. Lactate/GLUT labels are only for reference, as our model treats energy flow as the flow of a single fluid. The model should be understood to represent dynamics in a small region of the brain that has relatively uniform energy dynamics.