The foetal membrane, which is the source of first blood corpuscle to enter the circulation of the embryo is known as
A
Amnion
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B
Chorion
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C
Trophoblast
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D
Yolk sac
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Solution
The correct option is D Yolk sac The yolk sac is the extraembryonic membrane that surrounds the egg yolk. It has a well-developed vascular system, that transports nutrients from the egg yolk to the developing embryo. It is the principal site of RBC production until 6-8 weeks of embryonic development. During the second trimester, the liver is the primary source of RBCs.