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The effect of NPPB on dilatations to K+ in arteries mounted for isometric measurement of force. (a) In arteries where stepping [K+]o from 5.88 to 10.58 mM failed to produce relaxation, relaxation to K+ was induced in the presence of 1 μM NPPB. This effect was reversed by 30 μM Ba2+. Ten μM ACh was still able to relax fully in the presence of K+, NPPB and Ba2+. (b) Mean data (n=8±s.e.mean).
