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 can follow these steps:

### Step 1: Understand Hormone Mechanisms
Hormones can act through two primary mechanisms:
1. **Membrane-bound receptors**: Hormones bind to receptors on the plasma membrane, activating secondary messengers inside the cell. This is typical for peptide and protein hormones.
2. **Intracellular receptors**: Hormones can cross the plasma membrane and bind to receptors inside the cell. This is typical for steroid hormones and some small molecules like thyroxine.

### Step 2: Analyze Each Pair of Hormones
Now, we will analyze each provided pair of hormones to determine if they share a similar mechanism of action.

1. **Cortisol and Glucagon**:
- **Cortisol**: A steroid hormone that binds to intracellular receptors.
- **Glucagon**: A peptide hormone that binds to membrane-bound receptors.
- **Conclusion**: Different mechanisms.

2. **Estrogen and LH (Luteinizing Hormone)**:
- **Estrogen**: A steroid hormone that binds to intracellular receptors.
- **LH**: A peptide hormone that binds to membrane-bound receptors.
- **Conclusion**: Different mechanisms.

3. **Oxytocin and FSH (Follicle Stimulating Hormone)**:
- **Oxytocin**: A peptide hormone that binds to membrane-bound receptors.
- **FSH**: A peptide hormone that also binds to membrane-bound receptors.
- **Conclusion**: Same mechanism.

4. **Thyroxine and Insulin**:
- **Thyroxine**: An amino acid derivative hormone that binds to intracellular receptors.
- **Insulin**: A peptide hormone that binds to membrane-bound receptors.
- **Conclusion**: Different mechanisms.

### Step 3: Select the Correct Pair
From the analysis, the only pair of hormones that share the same mechanism of action is **Oxytocin and FSH**, as both are peptide hormones that bind to membrane-bound receptors.

### Final Answer
The correct answer is **Oxytocin and FSH**.

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