Foetal membrane that provides the first blood corpuscle for circulation in embryo is

Options

A. Amnion
B. Chorion
C. Trophoblast
D. Yolk sac

Answer

D

Explanation

The yolk sac has several important functions, is the source of blood cells from the third through sixth weeks. It supplies nutrients to the embryo during the second and third weeks of development. It contains the first cells (Primordial germ cells) that will eventually migrate into the developing gonads. It forms part of the gut and acts as a shock absorber.