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Calcium level decreases in the blood due to the hyposecretion of
Parathyroid hormone
Thyroxin
Calcitonin
Adrenalin
Answers (1)
Parathyroid Gland & Its Disorders -
In humans, four parathyroid glands are present on the backside of the thyroid gland, one pair each in the two lobes of the thyroid gland.
The cells of the parathyroid glands are arranged in a compact mass and are of two types: small chief cells or principal cells and large oxyphil cells (or eosinophil cells).
The chief cells of the parathyroid secrete a hormone called parathyroid hormone (PTH) or parathormone or also called Collip’s hormone.
This hormone regulates the calcium and phosphate balance between the blood and other tissues.
It mobilises the release of calcium into the blood from the bones.
PTH increases calcium absorption from the intestines.
It increases calcium resorption from the nephrons (and inhibits phosphate reabsorption) of the kidneys.
Parathyroids are under the feeding back control of blood calcium level.
A fall in blood calcium stimulates them to secrete parathormone, a rise in blood calcium inhibits parathormone secretion from them.
Thus PTH has an effect that opposes the effect of calcitonin.
-Hence, the correct option is a. parathyroid hormone
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