A person is having decreased calcium and phosphorus levels in his blood .Which one of the following glands may not be functioning properly?

Options

A. Parathyroid
B. Parotid
C. Pancreas
D. Thyroid

Explanation

To determine which gland may not be functioning properly in a person with decreased calcium and phosphorus levels in the blood, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Problem**: The person has decreased levels of calcium and phosphorus in the blood. This suggests a potential issue with the regulation of these minerals.

2. **Understand Calcium and Phosphorus Regulation**: Calcium and phosphorus levels in the blood are primarily regulated by hormones secreted by specific glands. The main glands involved are the parathyroid gland and the thyroid gland.

3. **Role of the Parathyroid Gland**: The parathyroid gland secretes parathyroid hormone (PTH), which is responsible for increasing calcium levels in the blood (hypercalcemia). It does this by promoting bone resorption, increasing intestinal absorption of calcium, and decreasing renal excretion of calcium.

4. **Role of the Thyroid Gland**: The thyroid gland secretes calcitonin (also known as thyrocalcitonin), which lowers blood calcium levels (hypocalcemia) by promoting calcium deposition in bones, reducing intestinal absorption, and increasing renal excretion of calcium.

5. **Analyze the Symptoms**: Since the person has decreased calcium levels, it indicates that the parathyroid hormone (PTH) should be active to increase the calcium levels. If the calcium levels are low, it suggests that the parathyroid gland may not be functioning properly, leading to insufficient secretion of PTH.

6. **Conclusion**: The gland that is likely not functioning properly in this scenario is the parathyroid gland, as it is responsible for increasing calcium levels in the blood. Therefore, the correct answer is the parathyroid gland.

### Final Answer:
The parathyroid gland may not be functioning properly.

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