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Fig. 7. Effects of buffer composition on the response of KCl (40 mmol
l1) pre-contracted efferent branchial arteries to addition
of 40 mmol l1 NH4Cl and NH4Cl washout
(Wash) 30 min later. Buffer composition did not affect the KCl contraction nor
the contraction accompanying NH4Cl addition. *The contraction
accompanying NH4Cl washout was significantly weaker in Cortland
than in Hepes buffer. Values are means ± s.e.m.; Hepes (N=4),
Cortland (N=4).