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Mathematics 13 Online
OpenStudy (javsteratl):

what controls ur heartbeat?

OpenStudy (rayep12):

The atria and ventricles work together, alternately contracting and relaxing to pump blood through your heart. The electrical system of your heart is the power source that makes this possible. Your heartbeat is triggered by electrical impulses that travel down a special pathway through your heart

candycove (candycove):

Satan controls your heart.

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