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Fig. 6. Single vasoconstrictor muscle fiber is innervated by several excitatory
axons. (A) Relationships between stimulus intensities and EJPs. The
pericardial nerve was stimulated by a 1 ms pulse of various intensities as
indicated. Four records are superimposed. Fast vertical deflections are
stimulus artifacts. Note that the increase in stimulus intensity not only
changes the peak amplitude of EJP, but also the shape of EJP. (B) Effect of
10–3 mol l–1 hexamethonium on EJPs evoked by
the stimulus train (1 ms, 1.6 V, 10 Hz) for 0.5 s.
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