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

Options

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

Answer

To determine which of the following is not a function of the placenta, we need to evaluate each option provided in the question. The functions of the placenta include:

1. **Facilitates removal of carbon dioxide and waste materials from the embryo**: This is indeed a function of the placenta. It helps in the excretion of waste products from the embryo into the maternal blood.

2. **Secretes oxytocin during parturition**: This is NOT a function of the placenta. Oxytocin is produced by the hypothalamus and released by the posterior pituitary gland, not by the placenta.

3. **Facilitates supply of oxygen and nutrients to the embryo**: This is a primary function of the placenta. It acts as a conduit for oxygen and nutrients from the mother to the embryo.

4. **Secretes estrogen**: The placenta does secrete estrogen, which is important for maintaining pregnancy and supporting fetal development.

Based on the evaluation of these options, the correct answer to the question "Which one of the following is not the function of placenta?" is:

**Secretes oxytocin during parturition.**

### Step-by-Step Solution:
1. **Identify the functions of the placenta**: Understand the roles the placenta plays in pregnancy, such as nutrient transfer, waste removal, and hormone secretion.

2. **Evaluate each option**: Go through each option provided in the question and determine if it is a recognized function of the placenta.

3. **Determine the incorrect function**: Identify which option does not align with the known functions of the placenta.

4. **Conclude with the correct answer**: State that the secretion of oxytocin during parturition is not a function of the placenta.