The first embryonic blood cells come from
A) the amnion.
B) the inner cell mass of the blastocyst.
C) the yolk sac.
D) the chorion.
E) the placenta.

Name: The first embryonic blood cells come from A) the amnion. B) the inner cell mass of the blastocyst. C) the yolk sac. D) the chorion. E) the placenta.
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Question

Quizplus · Accepted Answer

During embryonic development, the yolk sac is responsible for producing the first blood cells. This occurs around day 16 of development and marks the beginning of hematopoiesis.

The First Embryonic Blood Cells Come from