Effects of liquid volume secretion rates on biomolecular solids mass secretion rates in pig (A), non-CF human (B), and CF human (C) bronchi. For each sample, extracellular salts mass was subtracted from total solids mass to estimate biomolecular solids mass. A: slope of biomolecular solids mass secretion rate-liquid secretion rate relationship was not significantly different from zero, with r = 0.128326. B: slope of biomolecular solids mass secretion rate-liquid secretion rate relationship was significantly different from zero (P < 0.05), with r = 0.569590. C: slope of biomolecular solids mass secretion rate-liquid secretion rate relationship was significantly different from zero (P < 0.05), with r = 0.772658. Slopes and y-intercepts for the 3 groups of tissues are shown in Table 3.