Cardiac Cycle (Part 2 of 4)

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Date Uploaded: 05/02/2019

Tags: Atrial contraction  

Prior to atrial systole, blood has been flowing passively from the atrium into the ventricle through the open AV valve. During atrial systole the atrium contracts and tops off the volume in the ventricle with only a small amount of blood. Atrial contraction is complete before the ventricle begins to contract.

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