The Four Heart Chambers
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
The heart has four chambers: a right and left atrium above, and a right and left ventricle below.
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Blood enters an atrium and is pumped out by the ventricle beneath it.
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Right and left are the patient's, so on an image the right side appears on the left.