Which hormone thickens the lining of the uterus ?

Options

A. follicle stimulating hormone
B. estrogen
C. luteinizing hormone
D. Progesterone

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which hormone is responsible for thickening the lining of the uterus.

2. **Identifying Relevant Hormones**: The hormones related to the menstrual cycle include Follicle Stimulating Hormone (FSH), Luteinizing Hormone (LH), Estrogen, and Progesterone.

3. **Analyzing Each Hormone**:
- **Follicle Stimulating Hormone (FSH)**: This hormone is primarily involved in the growth and development of ovarian follicles. It does not directly contribute to the thickening of the uterine lining.
- **Luteinizing Hormone (LH)**: This hormone triggers ovulation and is important for the release of the egg. It does not play a direct role in thickening the uterine lining.
- **Estrogen**: This hormone peaks around the time of ovulation (approximately day 14 of the menstrual cycle). It is responsible for stimulating the thickening of the endometrial lining in preparation for a potential pregnancy.
- **Progesterone**: This hormone is involved after ovulation and helps maintain the uterine lining. However, it is more associated with the degradation of the lining if fertilization does not occur.

4. **Conclusion**: The hormone that primarily thickens the lining of the uterus is **Estrogen**.

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