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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 HubPages

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

The Four Heart Valves. Mitral and Tricuspid valves and the aortic and Pulmonic Valves

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Heart valve and strings, coloured scanning electron micrograph (SEM). This is the tricuspid valve (upper right), seen from the right ventricle of the heart

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