Which one of the following is the correct matching of the events occurring during mentrual cycle?

Options

A. Proliferative phase: Rapid regeneration of myometrium and maturaton of Graafian follicle
B. Secretory phase: Development of corpus luteum and increased secretion of progesterone
C. Menstruation: Breakdown of myometrium and ovum not fertilised
D. Ovulation: LH and FSH attain peak level and sharp fall in the secretion of progesterone

Answer

To determine the correct matching of events occurring during the menstrual cycle, we need to analyze each option provided in the question. The menstrual cycle typically lasts about 28 days and consists of four main phases: the menstrual phase, the proliferative phase, the ovulation phase, and the secretory (luteal) phase.

### Step-by-Step Solution:

1. **Understanding the Phases of the Menstrual Cycle:**
- The menstrual cycle is divided into four phases:
- Menstrual Phase
- Proliferative Phase
- Ovulation Phase
- Secretory (Luteal) Phase

2. **Analyzing Each Option:**
- **Option 1:** Proliferative phase involves regeneration of the myometrium and maturation of the Graafian follicle.
- **Analysis:** This is incorrect. The proliferative phase is characterized by the regeneration of the endometrial lining, not the myometrium. The maturation of the Graafian follicle does occur during this phase due to increased FSH levels.

- **Option 2:** Secretory phase involves the development of the corpus luteum and increased secretion of progesterone.
- **Analysis:** This is correct. The secretory phase, also known as the luteal phase, is marked by the formation of the corpus luteum from the ruptured Graafian follicle, which secretes progesterone essential for maintaining the uterine lining for potential pregnancy.

- **Option 3:** Menstruation is the breakdown of the myometrium and ovum not fertilized.
- **Analysis:** This is incorrect. Menstruation involves the breakdown of the endometrial lining, not the myometrium, when the ovum is not fertilized.

- **Option 4:** Ovulation involves peak levels of LH and FSH and a sharp fall in progesterone.
- **Analysis:** This is incorrect. During ovulation, there is a peak in LH (not FSH), and progesterone levels do not sharply fall at this point; they rise after ovulation due to the formation of the corpus luteum.

3. **Conclusion:**
- Based on the analysis, the only correct matching of events during the menstrual cycle is found in **Option 2**, which states that during the secretory phase, the development of the corpus luteum and increased secretion of progesterone occurs.

### Final Answer:
The correct matching of events occurring during the menstrual cycle is **Option 2**: During the secretory phase, the development of the corpus luteum and increased secretion of progesterone occurs.