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Which one of the following is not the function of placenta? It:

1. secretes estrogen
2. facilitates removal of carbon dioxide and waste material from embryo
3. secretes oxytocin during parturition
4. facilitates supply of oxygen and nutrients to embryo

Correct answer: secretes oxytocin during parturition

Solution

The placenta exchanges gases, nutrients, and wastes between mother and embryo, and it also secretes hormones like estrogen. Oxytocin, however, is not secreted by the placenta; it is released mainly by the posterior pituitary and helps trigger labor.

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