Level of which hormones are at their highest during secretory phase of menstrual cycle ?

Options

A. Estrogen
B. Progesterone
C. Luteinizing hormone
D. Follicular stimulating hormone

Answer

To determine which hormone levels are at their highest during the secretory phase of the menstrual cycle, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Menstrual Cycle Phases**: The menstrual cycle is divided into several phases: menstruation, proliferative phase, ovulation, and secretory phase. The secretory phase occurs after ovulation, typically from day 15 to day 28 of the cycle.

2. **Identify the Key Hormones**: The main hormones involved in the menstrual cycle are estrogen, progesterone, luteinizing hormone (LH), and follicle-stimulating hormone (FSH).

3. **Focus on the Secretory Phase**: During the secretory phase, the corpus luteum forms from the remnants of the follicle that released the egg during ovulation. The corpus luteum is crucial because it secretes hormones that prepare the uterus for a potential pregnancy.

4. **Determine the Dominant Hormone**: The hormone that is primarily secreted by the corpus luteum is progesterone. This hormone is responsible for maintaining the uterine lining and supporting early pregnancy if fertilization occurs.

5. **Conclusion**: Therefore, during the secretory phase of the menstrual cycle, the levels of progesterone are at their highest.

### Final Answer:
The hormone that is at its highest level during the secretory phase of the menstrual cycle is **progesterone**.

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