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Calcitonin...

Calcitonin

A

is secreted by the parathyroid glands

B

Causes blood calcium levels to decrease

C

insufficiency results in weak bones and tetany

D

levels increase when blood Calcium level decrease

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Calcitonin**: - Calcitonin is a peptide hormone composed of 32 amino acids. - It is secreted by the parafollicular cells (also known as C cells) of the thyroid gland. 2. **Function of Calcitonin**: - The primary function of calcitonin is to lower blood calcium levels. - It acts in opposition to parathyroid hormone (PTH), which increases blood calcium levels. 3. **Presence of Calcitonin**: - Calcitonin is found in various species, including fish, reptiles, birds, and mammals. 4. **Analyzing the Options**: - **Option 1**: "Secreted by the parathyroid gland." - This is incorrect because calcitonin is secreted by the thyroid gland, not the parathyroid gland. - **Option 2**: "Causes blood calcium level to decrease." - This is correct as calcitonin functions to reduce blood calcium levels. - **Option 3**: "Insufficiency results in weak bones and tetanus." - This is incorrect because a deficiency in calcitonin would not directly lead to weak bones or tetanus; rather, it would be associated with elevated calcium levels. - **Option 4**: "The level increases when blood calcium level increases." - This is incorrect as calcitonin is released to decrease blood calcium levels, not increase them. 5. **Conclusion**: - The correct answer is that calcitonin causes blood calcium levels to decrease (Option 2).
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