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Calcitonin is a thyroid hormone which...

Calcitonin is a thyroid hormone which

A

Elevates calcium level in blood

B

Has no effect on calcium

C

Elevates potassium level in-blood

D

lowers calcium level in blood

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Identify the Source of Calcitonin:** Calcitonin is a hormone produced by the thyroid gland, specifically by the parafollicular cells (also known as C-cells). 2. **Understand the Function of Calcitonin:** The primary function of calcitonin is to regulate calcium levels in the blood. It plays a crucial role in lowering the concentration of calcium in the bloodstream. 3. **Contrast with Parathyroid Hormone:** Calcitonin works antagonistically to parathyroid hormone (PTH), which is produced by the parathyroid glands. While calcitonin lowers blood calcium levels, PTH increases them. 4. **Mechanism of Action:** When blood calcium levels are high, calcitonin is secreted to lower these levels. It does this by promoting the deposition of calcium into the bones and inhibiting the release of calcium from the bones into the bloodstream. 5. **Conclusion:** Therefore, the correct answer to the question is that calcitonin lowers the calcium level in the blood. **Final Answer:** Calcitonin is a thyroid hormone which lowers the calcium level in the blood. ---
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