The trophoblast is the outer layer of cells in the blastocyst and is responsible for implantation and formation of the placenta. The inner cell mass gives rise to the fetus. The blastocoele is a fluid-filled cavity within the blastocyst that serves as a protective environment for the developing embryo, but it does not serve the functions of any organs.

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In the Blastocyst

Question 67

Multiple Choice

In the blastocyst

A) the trophoblast is destined to become the fetus
B) the trophoblast is destined to become the fetal portion of the placenta
C) the trophoblast is destined to become the inner cell mass
D) the blastocoele serves the functions of the digestive system, lungs, and kidneys for the fetus
E) the blastocoele is destined to become the fetus

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