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Abstract
The influence of varying humidity levels in the air surrounding the mucous membrane of rabbit tracheae has been investigated in vitro at 34°C, 37°C and 40°C. The following results were obtained: (1) The average mucociliary wave frequency was linearly reduced following decreasing levels of relative humidity (r.h.) from 90% to 20%. (2) A temperature of 40°C was more detrimental to the mucociliary function than that of 34°C and 37°C (body temperature) at decreasing levels of r.h. (3) At decreasing levels of r.h. the duration of experiments with preservation in recordable activity (“mucociliary survival time”) was significantly shorter (p < 0.05) between 50 % and 40 % r.h. than between 60 % and 50 % r.h.
