Parathormone is secreted during

Options

A. Increased blood calcium level
B. Decreased blood calcium level
C. Increased blood sugar level
D. Decrease blood sugar level

Answer

**Step-by-Step Solution:**

1. **Understanding Parathormone**: Parathormone, also known as parathyroid hormone (PTH), is a hormone secreted by the parathyroid glands. Its primary role is to regulate calcium levels in the blood.

2. **Role of Calcium Levels**: The secretion of parathormone is closely linked to the levels of calcium in the blood. The parathyroid glands monitor these calcium levels.

3. **Stimulus for Secretion**: When the blood calcium levels decrease (hypocalcemia), this serves as a stimulus for the parathyroid glands to secrete parathormone.

4. **Effect of Parathormone**: Once secreted, parathormone acts to increase the blood calcium levels by stimulating the release of calcium from bones, increasing calcium absorption in the intestines, and promoting calcium reabsorption in the kidneys.

5. **Negative Feedback Mechanism**: The secretion of parathormone is regulated by a negative feedback mechanism. When blood calcium levels rise (hypercalcemia), this high level inhibits the release of parathormone from the parathyroid glands.

6. **Conclusion**: Therefore, parathormone is secreted during decreased blood calcium levels, making this the correct answer to the question.

**Final Answer**: Parathormone is secreted during decreased blood calcium levels.

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