SA Node of the Heart
How does the SA node of the heart produce charges and how
do the charges develop? Also what ions are important in this process?
The cardiac cells of the SA node are said to be autorhythmic, or capable of
depolarization. They "fire" faster than the other cells in the area and so
set the pace of the depolarizations of other cells in the area.
Depolarization depends on differing concentrations of Na and K ions on
opposite sides of the membranes of the neurons.
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Update: June 2012