The secretory phase in the human menstrual cycle is also called

Options

A. Follcular phase and lasts for about 13 days
B. Luteal phase and lasts for about 6 days
C. Follicular phase lasting for about 6 days
D. Luteal phase and 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 four main phases: the follicular phase, ovulatory phase, luteal phase, and menstrual phase.

2. **Identifying the Phases:**
- The four phases are:
- **Follicular Phase:** This is the initial phase where the follicles in the ovaries mature.
- **Ovulatory Phase:** This phase involves the release of the ovum (egg) from the ovary.
- **Luteal Phase:** Following ovulation, this phase is characterized by the formation of the corpus luteum.
- **Menstrual Phase:** If fertilization does not occur, the endometrial lining is shed during this phase.

3. **Focusing on the Secretory Phase:**
- The secretory phase is synonymous with the luteal phase. During this phase, the corpus luteum secretes progesterone, which is essential for maintaining the endometrial lining for potential implantation of a fertilized egg.

4. **Duration of the Luteal Phase:**
- The luteal phase (or secretory phase) lasts approximately 13 to 15 days, which is crucial for preparing the uterus for possible pregnancy.

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

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