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Chemical Coordination and integration — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYChemical Coordination and integration2 Marks
Question
How does parathyroid hormone influences calcium uptake in the body?
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Answer

Parathyroid hormone (PTH) increases the $Ca ^{2+}$ levels in the blood. PTH acts on bones and stimulates the process of bone resorption (dissolution/demineralisation). PTH also stimulates reabsorption of $Ca ^{2+}$ by the renal tubules and increases $Ca ^{2+}$ absorption from the digested food. It is, thus, clear that PTH is a hypercalcemic hormone, ie, it increases the blood $Ca ^{2+}$ levels. Along with TCT, it plays a significant role in calcium balance in the body.

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