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andreyandreev [35.5K]
3 years ago
9

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

Biology
1 answer:
jekas [21]3 years ago
5 0
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.
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