reesescandy06
reesescandy06 reesescandy06
  • 02-04-2018
  • Biology
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Which of the following is a group of cells that sends signals to control the heart rate? Atrium Pacemaker Septum Valve

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makaylawoosley
makaylawoosley makaylawoosley
  • 02-04-2018
Should be Pacemakers
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donasv77
donasv77 donasv77
  • 02-04-2018
it is atrium pacemaker i think
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