Problem: The human blastocystA. has three germ layers.B. contains a fluid-filled central cavity.C. is the expanded end of the gastrula.D. is the fertilized egg.E. gives rise to umbilical blood vessels.

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The successful fusion of sperm and egg cells is known as fertilization. It forms the zygote that undergoes a series of cell division. During this process, blastocyst is formed four days after fertilization. This is simply the mammalian version of the blastula.

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Problem Details

The human blastocyst

A. has three germ layers.

B. contains a fluid-filled central cavity.

C. is the expanded end of the gastrula.

D. is the fertilized egg.

E. gives rise to umbilical blood vessels.