ballardkdog12 ballardkdog12

02-10-2017
Health

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The set of particular muscles and nerves which control the heart rate is called the

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legendman27 legendman27

02-10-2017

pacemaker is the set of muscles that control the heart

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kayleebueno kayleebueno

02-10-2017

Each beat of your heart begins with an electrical signal from within your heart.
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