Fig. 3. The influence of 10^-4 mol l^-1 acetazolamide added to the perfusion saline at 0 h on (A) Cl^- secretion rate, (B) oxygen consumption rate () and (C) carbon dioxide excretion rate () in the perfused rectal gland. Asterisks indicate means significantly different (P<0.05) from the control value at `C' before acetazolamide addition. Values are means ± 1 s.e.m. (N=6).