Chapter 1.c Concept Review: Refractory Periods Flashcards Preview

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Flashcards in Chapter 1.c Concept Review: Refractory Periods Deck (6)
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1

what happens to myocardial cells once they enter phase 0, depolarization?

cells become refractory to conduction of incoming impulses

2

refractory states are defined by what?

strength of impulse required for myocardial cell to generate and propagate an action potential

3

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

4

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

5

define supranormal period

SMALLER than normal impulse can elicit normal action potential

6

define reenterant circuit

consists of two separate pathways that differ in refractory period duration