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

Options

A. Facilitates supply of oxygen and nutrients to embryo
B. secretes oestrogen
C. facilitates removal of carbon dioxide and waste material from embryo
D. secretes oxytocin during parturition

Explanation

To determine which option is not a function of the placenta, we can analyze the functions of the placenta step by step.

### Step-by-Step Solution:

1. **Understanding the Placenta**: The placenta is an essential organ that forms during pregnancy. It connects the developing fetus to the uterine wall, allowing for nutrient uptake, waste elimination, and gas exchange via the mother's blood supply.

2. **Function 1 - Supply of Oxygen and Nutrients**: One of the primary functions of the placenta is to facilitate the supply of oxygen and nutrients to the embryo. This is done through the umbilical cord, which connects the fetus to the placenta.

3. **Function 2 - Hormone Secretion**: The placenta acts as an endocrine tissue, meaning it secretes hormones that are crucial for maintaining pregnancy. Key hormones produced include:
- Human Chorionic Gonadotropin (HCG)
- Human Placental Lactogen (HPL)
- Estrogen
- Progesterone

4. **Function 3 - Removal of Waste**: The placenta also plays a vital role in removing carbon dioxide and waste materials from the embryo. This process is also facilitated through the umbilical cord.

5. **Function 4 - Secretion of Oxytocin**: While the placenta does have various functions, it does not secrete oxytocin during parturition (the process of giving birth). Instead, oxytocin is produced by the pituitary gland, which is responsible for stimulating uterine contractions during labor.

6. **Conclusion**: Based on the analysis of the functions, the statement that the placenta secretes oxytocin during parturition is incorrect. Therefore, the correct answer to the question "Which one of the following is not the function of placenta?" is option 4.