Figure 3. Deactivation of IK(ACh) is independent of the concentration of ACh.
A, recording of membrane current from an atrial myocyte (2 days in vitro). ACh at various concentrations was applied as indicated. B, deactivation phases labelled a and b in A on expanded timescale. Traces were superimposed with regard to the point of time, when the exponential time course started, as indicated by the arrowhead.