The luteal phase in the menstrual cycle of primate female is also called

Options

A. secretory phase and lasts for about 13-14 days
B. follicular phase and lasts for about 6-7 days
C. proliferative phase and lasts for about 13-14 days
D. secretory phase and lasts for about 6-7 days

Answer

To solve the question regarding the luteal phase in the menstrual cycle of primate females, we will follow these steps:

### Step-by-Step Solution:

1. **Understanding the Menstrual Cycle**: The menstrual cycle in primate females consists of several phases: the follicular phase, ovulation, the luteal phase, and menstruation.

2. **Identifying the Luteal Phase**: The luteal phase occurs after ovulation and is characterized by the formation of the corpus luteum from the ruptured follicle. This phase is crucial for the preparation of the uterus for potential implantation of an embryo.

3. **Duration of the Luteal Phase**: The luteal phase typically lasts for about 13 to 14 days, which is a standard duration in the menstrual cycle.

4. **Alternative Name for the Luteal Phase**: The luteal phase is also known as the secretory phase. This name reflects the phase's role in secreting hormones, particularly progesterone, which is essential for maintaining the uterine lining.

5. **Evaluating the Options**:
- Option 1: Secretory phase - This is the correct answer as it is another name for the luteal phase.
- Option 2: Follicular phase - This is incorrect as it refers to the phase before ovulation.
- Option 3: Proliferative phase - This is also incorrect as it describes the phase that occurs after menstruation and before ovulation.
- Option 4: Secretory phase lasting for 6 to 7 days - This is incorrect because the secretory phase lasts for 13 to 14 days.

6. **Conclusion**: Based on the analysis, the correct answer is that the luteal phase in the menstrual cycle of primate females is also called the secretory phase.

### Final Answer:
The luteal phase in the menstrual cycle of primate females is also called the **secretory phase**.

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