babie20032003
babie20032003 babie20032003
  • 12-11-2016
  • Biology
contestada

Why is the SA node called the pacemaker of the heart?

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BobR9
BobR9 BobR9
  • 13-11-2016
It sends electrical impulses that cause the muscles of the heart to contract. It literally sets the rate of contractions, or in other words it controls the pace
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