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Calcitonin is...

Calcitonin is

A

Protein hormone

B

increases blood calcium level

C

Secreted from parathyroid gland

D

both 'a' and 'b'

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Calcitonin**: - Calcitonin is a hormone that plays a crucial role in calcium homeostasis in the body. 2. **Identifying the Type of Hormone**: - Calcitonin is classified as a peptide hormone, which is a type of protein hormone. This means it is made up of amino acids. 3. **Source of Calcitonin**: - Calcitonin is secreted by the thyroid gland, not the parathyroid gland. This is an important distinction to make. 4. **Function of Calcitonin**: - The primary function of calcitonin is to lower blood calcium levels. It does this by inhibiting the release of calcium from bones into the bloodstream. 5. **Comparison with Parathyroid Hormone**: - It is essential to differentiate calcitonin from parathyroid hormone (PTH), which is secreted by the parathyroid glands and serves to increase blood calcium levels. 6. **Conclusion**: - Based on the information, we can conclude that calcitonin is a protein hormone that lowers blood calcium levels and is secreted from the thyroid gland. ### Final Answer: Calcitonin is a protein hormone.
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