Embryonic cardiovascular system?

Is this statement true? First the embryo get the nutrient from diffusion. After that it gets the nutrients from the yolk sac via vitelline circulation. Then the umbilical vein and artery are developed thus constituting the placental circulation.
Answers:
Yes. Remember at hand is no circulatory system in the beginning. Those structures must be built with the stored calories within the yolk sac. When that runs out, the arterial tissues has been formed. (mammalian) Source(s): science teacher.

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