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Standard XII
Biology
The Parathyroid Gland
Question

Assertion :Hormone calcitonin has antagonistic effect to that of parathormone. Reason: Calcitonin decreases blood calcium level while parathormone increases blood calcium level.
  1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
  2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
  3. Assertion is correct but Reason is incorrect.
  4. Both Assertion and Reason are incorrect.

A
Assertion is correct but Reason is incorrect.
B
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
C
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
D
Both Assertion and Reason are incorrect.
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Solution
Verified by Toppr

Parathyroid hormone is secreted by the parathyroid glands and is the most important regulator of calcium levels in the blood and within the bones. Parathyroid hormone is mainly controlled by the negative feedback of calcium levels in the blood to the parathyroid glands. Low calcium levels in the blood stimulate parathyroid hormone secretion, whereas high calcium levels in the blood prevent the release of parathyroid hormone.
Thus, the correct answer is option A.

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