Explain functions of the following:-

(i) Placenta

ii) Foetal membrane

iii) Umbilical cord.

(i) Placenta: The placenta is a vital organ that forms during pregnancy, facilitating the exchange of nutrients, oxygen, and waste products between the mother and the fetus. It acts as a barrier to protect the fetus from harmful substances while allowing the passage of essential nutrients. Additionally, the placenta secretes hormones like human chorionic gonadotropin ______ ____ _______ _______ _______ _________ __________ _______.
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