How the cardiac cycle is produced by electrical impulses in the heart

The cardiac cycle
http://www.youtube.com/watch?v=5tUWOF6wEnk

Electrocardiograph
http://www.youtube.com/watch?v=ygsvAZVA6sc

How the cardiac cycle is produced by electrical impulses in the heart
http://www.youtube.com/watch?v=fZT9vlbL2uA

And some additional medical illustrations here:
http://pinterest.com/luxson/luxson-medicaltm/

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