Figure 3.

Original recordings of mechanical activity of strips tonically contracted with 0.3 μM U46619 P in the presence of 100 μM nitro-L-arginine (L-NA) and 10 μM indomethacin. Effect of 300 nM bradykinin (BK) and 10 nM substance P (SP) (IC₅₀-concentrations) and 4 μM nitroglycerin (NG). The experiments were done in a medium without potassium in the panels C and D. In the panels B and D the experiments were done in the presence of the potassium chelator 2 mM kryptofix 2.2.2.