Seudónimo
Seudónimo
17-10-2016
Health
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what cause the heart to pump
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soccershjk
soccershjk
17-10-2016
the SA node sends out regular electrical impulses from the top chamber )the atrium) causing it to contract and pump blood into the bottom chamber (the ventricle).
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belieber07
belieber07
17-10-2016
blood and blood vessels
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