Flashcards in Chapter 1.c Concept Review: Refractory Periods Deck (6)
what happens to myocardial cells once they enter phase 0, depolarization?
cells become refractory to conduction of incoming impulses
refractory states are defined by what?
strength of impulse required for myocardial cell to generate and propagate an action potential
during which phases are myocardial cells unable to propagate an action potential in response to a stimulus, REGARDLESS of strength of stimulus?
effective refractory period: phases 0, 2, and part of 3
during which phase, before the cell has returned to its resting membrane potential of -90 mV, can myocardial cells respond to a STRONGER than normal stimulus?
relative refractory period: during phase 3 of repolarization
define supranormal period
SMALLER than normal impulse can elicit normal action potential