What changes occur in developing embryo after implantation
Answers
In humans (as in all other mammals, except for monotremes), implantation is the very early stage of pregnancy at which theconceptus adheres to the wall of the uterus. At this stage of prenatal development, the conceptus is a blastocyst. It is by this adhesion that the foetus receives oxygen and nutrients from the mother to be able to grow.
In humans, implantation of a fertilized ovum is most likely to occur about 9 days after ovulation, ranging between 6 and 12 days.
Early on, the embryo changes from a free floating ball of cells into an embryo that is connected to the mother’s bloodstream. The egg arrives in the uterus seven to nine days after fertilization. It implants itself into the uterine lining and from this moment on it is called an embryo. After implantation, the embryo is connected to mother's bloodstream and can receive both nourishment and toxins such as nicotine through it.
The embryonic period begins at implantation, when the fertilized egg attaches itself into the uterine lining, and continues through the first eight weeks of pregnancy. This is when most rapid changes in prenatal development occur. All the major organs and body structures start developing during this short period. The baby is also extremely vulnerable during this time and miscarriages are the most common during the first 13 weeks if pregnancy, says the March of Dimes. Prenatal visits should start as soon as the woman finds out that she is pregnant, to ensure that the embryo is developing normally.