Terminology
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| Automaticity | Ability to initiate an impulse spontaneously & continuously.
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| Excitability | Ability to be electrically stimulated.
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| Conductivity | Ability to transmit an impulse along a membrane in an orderly manner.
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| Contractility | Ability to respond mechanically to an impulse.
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| Depolarization | Reduction of a membrane potential to a less negative value.
It is caused by the influx of cations, such NA & Ca, through ion channels in the membrane. In many neurons and muscle cells, Depolarization leads to an electris impulse caled an action potentia
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| Repolarization | the re-establishment of polarity, especially The return of cell membrane potential to resting potential after depolarization.
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| Cardiac cycle | Referring to all or any of the events related to the flow or blood pressure that occurs from the beginning of one heartbeat to the beginning of the next.
http://en.wikipedia.org/wiki/Cardiac_cycle#Stages_of_the_cardiac_cycle
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| Sinus rhythm | The normal beating of the heart, as measured by an electrocardiogram (ECG).
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