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

Options

A. (a) Facilitates removal of carbon dioxide and waste material from embryo.
B. (b) Secrets oxytocin during parturition.
C. (c) Facilitates supply of oxygen and nutrients to embryo.
D. (d) Secretes estrogen

Answer

To determine which option is not a function of the placenta, we will analyze each option provided in the question.

1. **Understanding the Role of the Placenta**: The placenta is an essential organ formed during pregnancy that connects the developing fetus to the uterine wall. It facilitates the exchange of nutrients, gases, and waste between the mother and the fetus.

2. **Analyzing Each Option**:
- **Option A**: "Facilitates the removal of carbon dioxide and waste material from the embryo."
- This is a true function of the placenta. The placenta allows for the exchange of waste products, including carbon dioxide, from the embryo to the mother's bloodstream.

- **Option B**: "Secretes oxytocin during parturition."
- This statement is false. Oxytocin is a hormone produced by the hypothalamus and released by the posterior pituitary gland. It plays a crucial role during childbirth (parturition) and breastfeeding but is not secreted by the placenta.

- **Option C**: "Facilitates the supply of oxygen and nutrients to the embryo."
- This is also a true function of the placenta. It is responsible for delivering oxygen and essential nutrients from the mother to the developing fetus.

- **Option D**: "Secretes estrogen."
- This statement is true as well. The placenta does secrete estrogen, which is necessary for maintaining pregnancy and supporting fetal development.

3. **Conclusion**: After analyzing all the options, we find that option B is the only statement that is not a function of the placenta. Therefore, the correct answer is option B.

### Final Answer:
**Option B: Secretes oxytocin during parturition.**