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The Beating Heart

#87, Slide 89 of 312

5 weeks, 6 days

From The Biology of Prenatal Development.

Note:

The beating heart is busy pumping blood and fills much of the chest. However, early lungs are growing quietly and inconspicuously on both sides of the chest.

Label Key:

1. chest wall

2. brain

3. heart

4. liver

All ages referenced to fertilization, not last menstrual period.

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