Explain:
1. Implantation
2. Placenta
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Answers
Answer:
(a) Implantation: ....
The embryo enters the uterus at the stage of the blastocyst and becomes attached to the wall of the uterus, where it is to perform its subsequent development. This attachment of the blastocyst to the uterine wall is known as implantation.
(b) placenta....
: It is a temporary organ built up of maternal and foetal tissues jointly. It serves for the transport of nutrients from the tissues of the mother with those of the embryo as well as the exchange of gases between the tissues of the two.
Explanation:
hope it help you.....
Implantation:
In humans (as in all other mammals, except for monotremes), implantation is the very early stage of pregnancy at which the embryo adheres to the wall of the uterus. At this stage of prenatal development, the embryo 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.
Placenta:
Placenta is a disc like tissue which is embedded in the uterine wall and contains villi on the embryo's side of the tissue and mother's side are blood spaces surrounding the villi. It plays an important role as the embryo gets nourishment inside the mother's body by a disc-like tissue placenta which gets developed between the uterus well and the embryo during the implantation. The nutrients, Oxygen and waste products are exchanged through this tissue.