At the Time of Implantation, the Human Embryo is Called

Question

At the time of implantation, the human embryo is called a
A) blastocyst.
B) gastrula.
C) fetus.
D) somite.
E) zygote.

Accepted Answer

The human embryo at the time of implantation is called a blastocyst. It is a hollow ball of cells that begins to implant in the uterus lining around 5-7 days after fertilization.