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Fig. 22 | Fluids and Barriers of the CNS

Fig. 22

From: Fluid and ion transfer across the blood–brain and blood–cerebrospinal fluid barriers; a comparative account of mechanisms and roles

Fig. 22

Transport schemes for CO2 (a) and (b), and for HCO3 (c) and (d). Transport of CO2 and HCO3 can be distinguished since the latter but not the former entails the transport of net charge. By contrast transport of HCO3 in one direction and transport of H+ in the other can produce the same net result. See text for further explanation. The proportion of CO2 transport that occurs by the mechanism in (b) is negligible

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