Briefly, explain how blood calcium level is regulated
What will be an ideal response
When blood Ca2+ levels drop, PTH is secreted from the parathyroid glands. PTH increases the activity of osteoclasts to increase bone resorption, which ultimately increases Ca2+ in blood. PTH also acts on the kidneys to prevent Ca2+ loss in the urine. PTH also stimulates the production of calcitriol, which acts on the GI tract to increase absorption of Ca2+ from the intestinal lining. When blood Ca2+ level increases, it causes the synthesis and release of calcitonin from the thyroid gland. Calcitonin, inhibits osteoclasts and stimulates osteoblastic activity to increase Ca2+ deposition into bones which promotes bone formation.
Question type: Multiple Choice
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What will be an ideal response?
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