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medicalschool:

A graphical representation of the Electrical conduction system of the heart showing the Sinoatrial node, Atrioventricular node, Bundle of His, Purkinje fibers, and Bachmann’s bundle.

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http://simplyjustobeythis.tumblr.com/

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DreamOutLoud

When the world says, "Give up," Hope whispers, "Try it one more time."

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