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Figure 4 | Fluids and Barriers of the CNS

Figure 4

From: Mechanisms of fluid movement into, through and out of the brain: evaluation of the evidence

Figure 4

Fluxes inwards or outwards across a membrane compared with net flux. The membranes are indicated by the grey bars. In a) and b) the magnitudes of the fluxes are very different but in both cases the fluxes in the two directions are equal and hence there is no net flux. In c) and d) the magnitudes of the fluxes in the two directions are very different and there is a net flux in the direction indicated by the black arrow. Although the flux from left to right is the same in a) and c), because the fluxes in the opposite direction are not the same there is a net flux in c) but not in a). Hence net flux cannot be inferred from measurements of flux in a single direction.

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