Which of the following statements is correct regarding menstural cycle

Options

A. LH induces rupturing of Graafian follicle.
B. Proliferative phase is characterized by the increased production of progesterone.
C. Corpus luteum secretes large amount of estrogen.
D. Both LH and FSH attain a peak level in secretory phase.

Answer

To solve the question regarding which statement is correct about the menstrual cycle, we can analyze each option step by step:

### Step 1: Understand the Menstrual Cycle
The menstrual cycle involves a series of hormonal changes that occur in the female reproductive system, typically lasting about 28 days. It consists of several phases: the follicular phase, ovulation, and the luteal (or secretory) phase.

**Hint:** Familiarize yourself with the phases of the menstrual cycle and the hormones involved.

### Step 2: Analyze Each Option

1. **Option 1: LH induces the rupturing of the Graafian follicle.**
- Luteinizing hormone (LH) is indeed responsible for triggering ovulation, which is the process where the mature Graafian follicle ruptures to release an egg. This statement is correct.

**Hint:** Remember that LH plays a crucial role in ovulation.

2. **Option 2: Proliferative phase is characterized by the increased production of progesterone.**
- The proliferative phase (or follicular phase) is primarily characterized by the increase in estrogen levels due to the growth of follicles. Progesterone levels rise after ovulation during the luteal phase. Therefore, this statement is incorrect.

**Hint:** Identify the hormones associated with each phase of the menstrual cycle.

3. **Option 3: Corpus luteum secretes large amounts of estrogen.**
- The corpus luteum primarily secretes progesterone, which is essential for maintaining the uterine lining for a potential pregnancy. While it does produce some estrogen, the statement that it secretes large amounts of estrogen is misleading. Thus, this statement is incorrect.

**Hint:** Focus on the primary hormones secreted by the corpus luteum.

4. **Option 4: Both LH and FSH attain a peak level in the secretory phase.**
- LH and FSH levels peak just before ovulation, not during the secretory phase. The secretory phase is characterized by the effects of progesterone from the corpus luteum. Therefore, this statement is also incorrect.

**Hint:** Recall the timing of hormone peaks in relation to ovulation.

### Conclusion
After analyzing all the options, the correct statement regarding the menstrual cycle is:
**"LH induces the rupturing of the Graafian follicle."**

**Final Answer:** Option 1 is correct.