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Fig. 2. Effects of extracellular pH on efferent branchial artery contractions
produced by arginine vasotocin (AVT; 1 nmol l1), potassium
chloride (KCl; 50 mmol l1) or potassium acetate (KAc; 50
mmol l1) in phosphate (PBS) or Hepes buffer. Values are
means ± s.e.m. (N=4). *Different from same agonist (KCl or
KAc) at all pH values lower than 8.2 or 8.6;
different from
AVT at higher pH.