Transcription: This video shows a human heart beating while it is still inside the person. The red and the yellow areas make up the heart. Here's the left atrium and here's the right atrium. You can't distinguish the left ventricle from the right ventricle, but they're both there. Notice then how the heart beats. The atria swell with blood and then they contract pushing that blood into the ventricles. This makes the ventricles swell with blood and when they contract they push the blood out of the heart. heart. This allows the atria to fill up with new blood. You might be wondering how we can see this heart p ...
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