Secrection of which of the following antagonistic hormones is not under the control of pituitary gland?

Options

A. PTH-Calcutonin
B. Calcitonin-Calcitriol
C. Glucocorticoids-cortisol
D. LH-FSH

Answer

To answer the question regarding which antagonistic hormones are not under the control of the pituitary gland, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Antagonistic Hormones**:
- Antagonistic hormones are pairs of hormones that have opposite effects on the same physiological function. For example, one hormone may increase a certain function while the other decreases it.

2. **Analyzing Option A: PTH and Calcitonin**:
- Parathyroid hormone (PTH) increases blood calcium levels, while calcitonin decreases blood calcium levels.
- Both of these hormones are produced by the parathyroid glands and the thyroid gland, respectively, and their secretion is not directly controlled by the pituitary gland.
- Therefore, this option is a candidate for the answer.

3. **Analyzing Option B: Calcitonin and Calcitriol**:
- Calcitonin, as mentioned, decreases blood calcium levels, while calcitriol (the active form of vitamin D) increases calcium absorption in the intestines.
- Both hormones are involved in calcium metabolism, but calcitriol is not directly controlled by the pituitary gland.
- Hence, this option is also a candidate for the answer.

4. **Analyzing Option C: Glucocorticoids and Cortisol**:
- Glucocorticoids (including cortisol) are hormones produced by the adrenal cortex and are regulated by the adrenocorticotropic hormone (ACTH) from the pituitary gland.
- Therefore, this option is incorrect as these hormones are under the control of the pituitary gland.

5. **Analyzing Option D: LH and FSH**:
- Luteinizing hormone (LH) and follicle-stimulating hormone (FSH) are both produced by the anterior pituitary gland and are involved in regulating the reproductive system.
- Hence, this option is also incorrect as these hormones are under the control of the pituitary gland.

6. **Conclusion**:
- The correct answer is **Option A: PTH and Calcitonin**, as both of these hormones are antagonistic and their secretion is not under the control of the pituitary gland.

### Final Answer:
**Option A: PTH and Calcitonin**