Q. 3

Calcium plays a very important role in the formation of bones. Write on the role of endocrine glands and hormones responsible for maintaining Calcium homeostasis.

Answer :

• Thyroid gland and parathyroid gland are responsible for maintaining calcium homeostasis.


• Both of the glands are antagonist with each other.


• As Calcitonin which is peptide hormone secretes from thyroid gland response to high calcium level in the blood.


• Calcitonin decreases plasma calcium concentration by decreasing mobilization of calcium from bones.


• Whereas parthyroid gland which secretes parathyroid hormone increases calcium level in blood.


• Bone tissue acts as astrongreservoiur for calcium and PTH stimulates the removal of calcium from bone to increase level in blood.


• It increases the reabsorption of calcium by renal tubules of kidney.


• PTH is a hypercalcemic hormone. i.e it increases the blood calcium level.


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