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Test

11 bytes removed, 21:52, 27 May 2009
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[[Image:conduction_system_en.png|thumb|left|250px]]
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|<flashow>http://nl.ecgpedia.org/images/0/09/Normal_SR.swf|height=300px|width=100%</flashow>
|}
'''The sinal node (SA node) contains pacemakercells which determine the heart frequency.'''
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