Select the pair of hormones having a similar mechanism/mode of action .

Options

A. Glucagon and cortisol
B. Estrogen and LH
C. Oxytocin and FSH
D. Thyroxine and insulin

Answer

To solve the question of selecting the pair of hormones having a similar mechanism or mode of action, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Hormone Functions**:
- Hormones can have various functions and mechanisms of action. We need to identify which pairs share a similar mechanism.

2. **Analyzing Option A: Glucagon and Cortisol**:
- **Glucagon**: This hormone stimulates glucose production in the liver.
- **Cortisol**: This is a glucocorticoid that also stimulates gluconeogenesis (the production of glucose from non-carbohydrate sources).
- **Conclusion**: While both hormones are involved in glucose metabolism, they do not share a similar mechanism of action. Thus, this option is incorrect.

3. **Analyzing Option B: Estrogen and Luteinizing Hormone**:
- **Estrogen**: Primarily involved in the maturation of sperm in males and regulation of the menstrual cycle in females.
- **Luteinizing Hormone (LH)**: Stimulates the Leydig cells in males to produce testosterone and plays a role in ovulation in females.
- **Conclusion**: These hormones have different roles and mechanisms, making this option incorrect.

4. **Analyzing Option C: Oxytocin and Follicle Stimulating Hormone (FSH)**:
- **Oxytocin**: Released during childbirth and lactation, it promotes uterine contractions and milk ejection.
- **Follicle Stimulating Hormone (FSH)**: Secreted by the anterior pituitary, it stimulates the growth of ovarian follicles in females and spermatogenesis in males.
- **Conclusion**: Although both hormones are involved in reproductive processes, they act through different mechanisms. This option is incorrect.

5. **Analyzing Option D: Thyroxin and Insulin**:
- **Thyroxin**: A thyroid hormone that plays a vital role in metabolism, brain development, and bone maintenance.
- **Insulin**: A hormone that regulates glucose levels in the blood.
- **Conclusion**: These hormones have distinct functions and mechanisms, making this option incorrect.

6. **Final Conclusion**:
- After analyzing all options, it appears that none of the pairs provided share a similar mechanism of action. However, if we consider the closest pair in terms of their roles in the reproductive system, **Oxytocin and Follicle Stimulating Hormone** could be seen as having related functions in reproduction, but they still do not share a similar mechanism.

### Correct Answer:
None of the options provided have a pair of hormones with a similar mechanism of action.