Which of the following pituitary hormones does not directly control other endocrine glands or structures?

Options

A. Thyroid - stimulating hormone (TSH)
B. Lutenizing hormone (LH)
C. Adrenocorticotrophic hormone (ACTH)
D. Growth hormone (GH)

Answer

To solve the question "Which of the following pituitary hormones does not directly control other endocrine glands or structures?", we will analyze the given options one by one.

### Step-by-Step Solution:

1. **Identify the Hormones**: The options provided are:
- Thyroid Stimulating Hormone (TSH)
- Luteinizing Hormone (LH)
- Adrenocorticotropic Hormone (ACTH)
- Growth Hormone (GH)

2. **Analyze Thyroid Stimulating Hormone (TSH)**:
- TSH is secreted by the anterior pituitary gland.
- It acts on the thyroid gland, stimulating it to release thyroid hormones (T3 and T4).
- **Conclusion**: TSH directly controls another endocrine gland (the thyroid gland).

3. **Analyze Luteinizing Hormone (LH)**:
- LH is also secreted by the anterior pituitary gland.
- In males, it stimulates the testes to produce testosterone. In females, it triggers ovulation by acting on the ovaries.
- **Conclusion**: LH directly controls other endocrine structures (testes and ovaries).

4. **Analyze Adrenocorticotropic Hormone (ACTH)**:
- ACTH is secreted by the anterior pituitary gland.
- It stimulates the adrenal cortex to release cortisol.
- **Conclusion**: ACTH directly controls another endocrine gland (the adrenal cortex).

5. **Analyze Growth Hormone (GH)**:
- GH is secreted by the anterior pituitary gland.
- It primarily stimulates growth and metabolism in tissues and bones.
- **Conclusion**: GH does not act on other endocrine glands; it directly affects tissues and bones.

6. **Final Answer**:
- Based on the analysis, the hormone that does not directly control other endocrine glands or structures is **Growth Hormone (GH)**. Therefore, the correct answer is option D.