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Tube-Shaped Heart

3 weeks old / 5 weeks pregnant (since LMP)

From The Biology of Prenatal Development.

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Note:

My simple tube-shaped heart doesn't stay this way very long. I am changing so fast in so many places that I need my heart to start working as soon as possible!

Label Key:

1. blood will leave here
2. blood will enter here

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Tube-Shaped Heart

Three-Week Embryo

The Folding of the Embryo

Heart Chambers and Liver

Heart in Slow Motion

The Early Brain and Face

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