Figure 3

Volumes of excised lungs at 3 cm H2O did not vary with vitamin A status. In the absence of carbamycholine (CCh), residual volume (RV) was determined by volume displacement and the volume of air required to maintain 3 cm pressure was ascertained from the deflation pressure volume curve (open bars). A similar determination was made immediately after CCh-administration (hatched bars). Volumes (V, mean ± SEM, n = 8 for each vitamin A treatment group) shown are the sum of RV (volume at 0 cm) and the volume required to maintain 3 cm H2O pressure. (*) V after CCh greater than before CCh (p < 0.05, 2-way ANOVA, Student-Newman-Keuls post-hoc test).