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Question

Which of the following in mammals does not play a central role in calcium balance in the human body?

A
Thymosin
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B
Vitamin D
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C
Parathyroid hormone
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D
Thyrocalcitonin
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Solution

The correct option is A Thymosin
Vitamin D:

Vitamin D helps in the absorption of Ca2+ from the intestine and maintains the normal level of Ca2+ ions in the blood. This assists in bone formation.



Parathyroid hormone:

Parathyroid hormone released from the parathyroid glands plays a role in maintenance of calcium-phosphorus balance in the blood. It increases the calcium ions in the blood in the following ways:-
  • Bone demineralisation: Stimulating the release of calcium from bones
  • Reabsorption of calcium ions from the renal tubules
  • Absorption of calcium ions from the digested food




Thyrocalcitonin:

Thyrocalcitonin is released from the parafollicular cells of the thyroid gland. It lowers the level of blood Ca2+ by the following ways:-
  • Inhibiting the release of Ca2+ from the bones by limiting the activities of osteoclasts
  • Limiting the absorption of calcium from the digested food after a certain level
  • Increased excretion of calcium ions via urine


Thymosin :

Thymosin is released from the thymus glands and plays a role in the differentiation of the T cells and stimulating antibody production from the B cell, thus promoting immunity


Final answer: d. Thymosin

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