Question

Which of the following is not the function of placenta?
A. Secretes oxytocin during parturition
B. Facilitates supply of ${O_2}$ and nutrients to embryo
C. Secretes oestrogen
D. Facilitates removal of $C{O_2}$ and waste products from embryo

Answer 1

After implantation, finger like projection appears on the trophoblast and chorionic villi which are surrounded by the uterine tissue and maternal blood. The chorionic villi and uterine tissue become interdigitated with each other and jointly form a structural and functional unit between developing embryo and maternal blood called placenta.
Placenta is an organ that connects the foetus and uterine wall. It constitutes both maternal as well as foetal parts although there is no mixing of maternal and foetal blood supplies.

Complete answer:
Secretes oxytocin during parturition:- placenta secretes lots of hormones to nourish embryos but it doesn’t secrete oxytocin hormone which is used for delivery of babies. Hence this is not the function of placenta. So the option is correct with respect to the question.
Facilitates supply of ${O_2}$ and nutrients to embryos:-placenta is used to provide nutrients to embryos and helps in gas exchange. It is a function of the placenta. So the option goes wrong.
Secretes oestrogen- placenta secretes many hormones .it is one of them. Hence this option is not correct.
Facilitates removal of $C{O_2}$ and waste products from the embryo- placenta is primarily involved in excretion. Hence this option is not correct.

Our correct option is a that secretes oxytocin during parturition.

Note:

Placenta do not secretes oxytocin rather it secretes relax for softening the connective tissue of the pubic symphysis during parturition.
Placenta acts as an endocrine gland and synthesizes large quantities of proteins and some hormones such as human chorionic gonadotropins , chorionic thyrotropin , oestrogens and progesterone.
The metabolic activity of the placenta is almost as great as that of foetus itself.