The secretory phase in the human menstrual cycle is also called:

Options

A. luteal phase and lasts for about 13 days follicular phase and lasts for about 13 days
B. luteal phase and lasts for about 6 days
C. follicular phase and lasting for about 6 days
D. Follicular phase lasts for about 13 days

Answer

**Step-by-Step Solution:**

1. **Understanding the Menstrual Cycle**: The human menstrual cycle typically lasts about 28 days and consists of two main phases: the follicular phase and the secretory phase.

2. **Identifying the Phases**:
- The **follicular phase** lasts approximately 14 days and is characterized by the development of follicles in the ovaries, leading to the maturation of an ovum (egg).
- The **secretory phase**, which follows the follicular phase, also lasts about 14 days.

3. **Defining the Secretory Phase**: During the secretory phase, the ovum is released from the ovary (ovulation) and travels to the fallopian tube, where it may be fertilized. Additionally, the uterine lining thickens in preparation for a potential implantation of a fertilized egg.

4. **Naming the Secretory Phase**: The secretory phase is also known as the **luteal phase**. This is due to the presence of the corpus luteum, which forms from the remnants of the follicle after ovulation and secretes hormones to support the uterine lining.

5. **Evaluating the Options**: The question provides several options regarding what the secretory phase is called:
- Luteal phase and lasts for about 13 days
- Follicular phase and lasts for about 13 days
- Luteal phase and lasts for about 6 days
- Follicular phase and lasts for 6 days
- Follicular phase lasts for about 13 days

The correct answer is the first option: **Luteal phase and lasts for about 13 days**.

6. **Conclusion**: Therefore, the secretory phase in the human menstrual cycle is also called the **luteal phase**.

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