Fig. 5. The influence of experimental manipulations of acid-base status on the relative rate of Cl^- secretion rate in the perfused rectal gland. Secretion rate after 2 h of experimental treatment is expressed as a percentage of the pre-treatment control (Con) measurement. Measured values of extracellular pHe and intracellular pHi are given; for other acid-base parameters, see Table 4. Means sharing the same letter are not significantly different (P>0.05). Values are means (+1 s.e.m.) (N=6-7).