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The Parathyroid Gland

Parathyroid h...

Question

Parathyroid hormone

A

Is produced by the thyroid gland

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B

Is released when blood calcium levels fall

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C

Stimulates osteoblasts to lay down new bone

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D

Stimulates calcitonin release

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Solution

The correct option is C Is released when blood calcium levels fall
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.

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Q. Which hormone is produced and released when blood calcium level is high?

Q. The pineal gland secretes a hormone progesterone which helps to regulate sleep pattern. Thyroid glands release hormone which regulate the level of calcium in the blood with the help of calcitonin which is produced in the parathyroid glands. Select the correct option regarding the given paragraph.
i) Positions of pineal and parathyroid should be interchanged
ii) Progesterone must be replaced by melatonin
iii) Parathyroid should not be replaced as it is correctly mentioned.
iv) Positions of progesterone and calcitonin should be interchanged
v) Positions of thyroid and parathyroid should be interchanged

Q. Assertion :Hormone calcitonin has antagonistic effect to that of parathormone. Reason: Calcitonin decreases blood calcium level while parathormone increases blood calcium level.

Q. How do hormones from the thyroid and parathyroid regulate the calcium concentration of the blood?

Q. Thyroid gland secretes a hormone called calcitonin, which lowers the amount of calcium in blood.

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