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Fig. 5. Monthly variation in a five-year set of mean internal contraction ratios in response to 2x10-5 mol l-1 5HT. Each demibranch was exposed twice to 5HT with a 30 min or 1 h period of relaxation between exposures; the internal contraction ratio is the second response/initial response for each demibranch. Values are means ± 1 S.E.M., N=14 (Jan), 23 (Feb), 51 (Mar), 35 (Apr), 39 (May), 46 (June), 80 (July), 39 (Aug), 32 (Sept), 30 (Oct), 17 (Nov), 13 (Dec).