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

02-04-2018

Should be Pacemakers

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donasv77 donasv77

02-04-2018

it is atrium pacemaker i think

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