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

Question

Quizplus · Accepted Answer

At the time of implantation, the human embryo has undergone several divisions and differentiated into two distinct cell types, the inner cell mass and the outer layer of trophoblast cells. It is now called a blastocyst. The zygote is the single cell formed by the fusion of sperm and egg. The gastrula is a later stage of development characterized by the formation of three germ layers. The fetus is a term used for a developing human after the eighth week of gestation.

At the Time of Implantation, the Human Embryo Is Called