Figure 4. Effects of an alternative regenerating system on stop flow response.

A, effect of stopping flow on [Ca²⁺] in the absence of CP. B, stopping flow in the presence of an alternative regenerating system comprising PEP (5 mm) and PK (50 units ml⁻¹). C, stopping flow in the presence of PEP, but in the absence of PK. D, stopping flow in the presence of PK, but in the absence of PEP. In each example, the control response to stopping the flow in the presence of 10 mm CP is superimposed (lower trace). All responses were obtained from the same preparation.