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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