Describe what is occurring in the heart (regarding contraction) during each step of the electrical activity

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Describe what is occurring in the heart (regarding contraction) during each step of the electrical activity.  In other words, what does the electrical activity indicate is happening in the heart (atria contraction, ventricle contraction/relaxation, etc).

Also, explain how these contractions lead to proper blood flow sending blood to the appropriate areas for oxygen delivery.

This section should be no more than one page in length (double-spaced for APA format) and should give detailed information about how these three aspects of the heart (electrical activity, contraction, blood flow) work together to serve our tissues.