Luteinising hormone (LH) in female

Options

A. Helps in the appearance of secondary sexual characters
B. Stimulates ovary to secrete oestradiol
C. Helps in release of the ovum from the ovary
D. Controls the blood pressure

Answer

### Step-by-Step Solution:

1. **Understanding Luteinizing Hormone (LH)**:
- Luteinizing hormone (LH) is a key hormone in the female reproductive system. It plays a crucial role in regulating the menstrual cycle and ovulation.

2. **Role in the Menstrual Cycle**:
- The menstrual cycle is typically a 28-day cycle. Around the 14th day of this cycle, there is a surge in LH levels, which is a sudden increase in the hormone.

3. **Impact of LH Surge**:
- The surge in LH leads to the rupture of the Graafian follicle, which is the structure in the ovary that contains the developing egg. This process is known as ovulation.

4. **Formation of Corpus Luteum**:
- After ovulation, the Graafian follicle transforms into the corpus luteum, which is maintained by LH. The corpus luteum is important for producing hormones that support the early stages of pregnancy.

5. **Evaluating the Options**:
- Now, let's analyze the given options:
- **Option A**: Helps in the appearance of secondary sexual characters - This is incorrect; estrogen is responsible for this.
- **Option B**: Stimulates ovary to secrete estradiol - This is incorrect; follicle-stimulating hormone (FSH) plays a role in this.
- **Option C**: Helps in the release of ovum from the ovary - This is correct; LH is responsible for ovulation.
- **Option D**: Controls the blood pressure - This is incorrect; aldosterone is responsible for blood pressure regulation.

6. **Conclusion**:
- The correct answer is **Option C**: Helps in the release of ovum from the ovary, as this is the primary function of luteinizing hormone in females.