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Figure 3


Fig. 3. (A) H2S dose–response curves for hagfish dorsal aortas (filled circles; N=22) and efferent branchial arteries (filled triangles; N=8) bubbled with room air, and dorsal aortas bubbled with 100% nitrogen (open circles; N=10). Aortas bubbled with nitrogen were significantly (*) more sensitive to low concentrations of H2S than air-bubbled aortas and appear to have a two-phase response to H2S. H2S at 100 and 300 µmol l–1 produces a significantly greater response in normoxic efferent branchial arteries than normoxic dorsal aortas ({dagger}). (B) H2S dose–response curves for lamprey dorsal aortas bubbled with room air (filled circles; N=8) or during moderate hypoxia (open circles; N=8). Hypoxic vessels were significantly (*) more sensitive to H2S. Values are means ± s.e.m.





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