- Activationoftheheartnormallybeginsinthesinoatrialnode.CardiomyocytesinthesinoatrialnodeThisimageshowsasectionofthesinoatrialnode,apacemakingareaoftherightatriumoftheheart.Itischaracterizedbysinoatrialnodedysfunctionandoftenincludesatrioventricularnod...
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