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Anatomy of the Heart: Blood flow through the Heart and the Heart Valves involved.

During pregnancy, the fetal lungs are not used for breathing—the placenta does the work of exchanging oxygen and carbon dioxide through the mother's circulation. With the first breaths of air the baby takes at birth, the fetal circulation changes.

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From freshman year all the way until graduation, the circulation of the heart will haunt you! But, you can fight back by becoming confident in your cardiac anatomy and physiology as you memorize the 21 steps of circulation.