Which of the following hormones is not secreted by human placenta?

Options

A. hCG
B. Estrogens
C. Progesterone
D. LH

Answer

To determine which hormone is not secreted by the human placenta, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of the Placenta**: The placenta is an organ that develops in the uterus during pregnancy and is responsible for nutrient and gas exchange between the mother and the fetus. It also secretes several hormones that are crucial for maintaining pregnancy.

2. **Identify Hormones Secreted by the Placenta**: The main hormones secreted by the human placenta include:
- Human Chorionic Gonadotropin (HCG)
- Human Placental Lactogen (HPL)
- Estrogen
- Progesterone
- Relaxin

3. **Analyze the Given Options**: The question provides a list of hormones, including:
- Estrogen
- Progesterone
- Luteinizing Hormone (LH)

4. **Determine Which Hormone is Not Secreted by the Placenta**:
- **Estrogen**: Secreted by the placenta.
- **Progesterone**: Secreted by the placenta.
- **Luteinizing Hormone (LH)**: This hormone is produced by the anterior pituitary gland and is not secreted by the placenta.

5. **Conclude the Answer**: Since LH is not secreted by the human placenta, the correct answer is Luteinizing Hormone (LH).

### Final Answer:
The hormone that is not secreted by the human placenta is **Luteinizing Hormone (LH)**.

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