Question

define the term implantation,gastrulation, placentation

in berifly

Answer 1

In humans, implantation is the stage of pregnancy at which the embryo adheres to the wall of the uterus. At this stage of prenatal development, the conceptus is called a blastocyst. It is by this adhesion that the embryo receives oxygen and nutrients from the mother to be able to grow.the formation or arrangement of a placenta or placentae in a woman's or female animal's uterus.Gastrulation occurs when a blastula, made up of one layer, folds inward and enlarges to create a gastrula. ... In triploblastic organisms the gastrula is trilaminar ("three-layered"). These three germ layers are known as the ectoderm, mesoderm, and endoderm.