1.

After implantation interdigitation of maternal and foetal tissues takes place. Identify the tissues involved and justify their role.

Answer»

After implantation interdigitation of maternal and foetal tissues results in formation of structural and functional unit between embryo and maternal body called placenta. 

It facilitates supply of oxygen and nutrients to the embryo, removal of carbon dioxide and excretory material and also acts as an endocrine tissue and produces hormones like HCG, hPL, estrogen, progesterone and relaxin.



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