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I. Maximum iodine is stored in thyroid ...

I. Maximum iodine is stored in thyroid gland
II. Calcitonin is non-iodinised hormone secreted by parafollicular cells of thyroid gland
III. Calcitonin (TCT) regulates the blood `Ca^(+2)` level
IV. TCT is hypocalcemic factor

A

All are correct

B

All are wrong

C

Only, I, and III are correct

D

Only IV is correct

Text Solution

AI Generated Solution

The correct Answer is:
To determine the correctness of the statements regarding the thyroid gland and its hormones, let's analyze each statement step by step. ### Step-by-Step Solution: **Statement I: Maximum iodine is stored in the thyroid gland.** - The thyroid gland is known for its ability to absorb and store iodine, which is essential for the synthesis of thyroid hormones, particularly thyroxine (T4). Therefore, this statement is **correct**. **Statement II: Calcitonin is a non-iodinised hormone secreted by parafollicular cells of the thyroid gland.** - Calcitonin, also known as thyroid calcitonin (TCT), is indeed secreted by the parafollicular cells (also called C cells) of the thyroid gland. Unlike thyroid hormones like thyroxine, calcitonin does not contain iodine. Thus, this statement is also **correct**. **Statement III: Calcitonin (TCT) regulates the blood Ca²⁺ level.** - Calcitonin plays a crucial role in regulating calcium levels in the blood. It lowers blood calcium levels by inhibiting osteoclast activity in bones and promoting calcium excretion in the kidneys. Therefore, this statement is **correct**. **Statement IV: TCT is a hypocalcemic factor.** - Since calcitonin decreases the concentration of calcium in the blood, it is indeed classified as a hypocalcemic factor. This means it helps to lower blood calcium levels, making this statement **correct** as well. ### Conclusion: All four statements are correct. Therefore, the final answer is that **all statements are correct**.
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