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The sa node acts as the pacemaker of the heart because these cells are __________.
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The sa node acts as the pacemaker of the heart because these cells are __________.

User Max Charas
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The heartbeat has two specialised areas of muscle (the sa node and the av node) that control and synchronise the heartbeat. The rhythm of relaxation and concentration of the pacemaker sets the rythym of the heartbeat.
User Krzysztof Majewski
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