In a normal pregnant woman, the amount of total gonadotropin activity was assessed. The result expected was

Options

A. High level of circulating FSH and LH in the uterus to stimulate implantation of the embryo
B. High level of circulating hCG to stimulate endometrial thickening
C. High levels of FSH and LH in uterus to stimulate endometrial thickening
D. High level of circulating hCG to simulate estrogen and progesterone synthesis

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the expected result of total gonadotropin activity in a normal pregnant woman, specifically focusing on Human Chorionic Gonadotropin (HCG).

2. **Identifying the Role of HCG**: HCG is a hormone produced by the placenta after implantation. Its primary function is to maintain the corpus luteum during early pregnancy.

3. **Function of the Corpus Luteum**: The corpus luteum produces progesterone and estrogen, which are crucial for maintaining the uterine lining and supporting the early stages of pregnancy.

4. **Effects of Progesterone and Estrogen**: Progesterone helps to thicken the uterine lining (endometrium) and enriches it with blood vessels, creating a suitable environment for the developing embryo.

5. **Analyzing the Options**:
- **Option 1**: High levels of circulating FSH and LH in the uterus to stimulate implantation of the embryo. (Not correct, as FSH and LH levels decrease during pregnancy.)
- **Option 2**: High level of circulating HCG to stimulate endometrial thickening. (Partially correct but not the main function of HCG.)
- **Option 3**: High level of FSH and LH in the uterus to stimulate endometrial thickening. (Not correct, similar to option 1.)
- **Option 4**: High level of circulating HCG to stimulate estrogen and progesterone synthesis. (Correct, as HCG maintains the corpus luteum which produces these hormones.)

6. **Conclusion**: The expected result in a normal pregnant woman is a high level of circulating HCG that stimulates the synthesis of estrogen and progesterone.

### Final Answer:
**The expected result is: High level of circulating HCG to stimulate estrogen and progesterone synthesis. (Option 4)**

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