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excitability (ek-sI´ta-bil´i-te)

Having the capability of being excitable.
supranormal e. at the end of phase three of the cardiac action potential, the successful stimulation threshold falls below (i.e., less negative than) the level necessary to produce excitation during the rest of the phase of diastole, so that an ordinary subthreshold stimulus becomes effective. Cf. supranormal conduction.


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