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Figure 7


Fig. 7. Effects of 10–4 mol l–1 acetazolamide in control and HCO3–-free saline on fluid secretion rate by 10–6 mol l–1 5-HT stimulated Malpighian tubules. Tubules were exposed to acetazolamide (open symbols) or to the vehicle alone (filled symbols). Arrow indicates addition of acetazolamide to tubules bathed in (A) control saline (mean ± s.e.m.; N=8) or (B) HCO3–-free saline (mean ± s.e.m.; N=8).