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(B) The parathyroid gland is primarily regulated by the concentration of calcium ions in the blood.When blood $Ca^{+2}$ levels fall (hypocalcemia),the

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Fall in blood $Ca^{+2}$ levels

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(B) The parathyroid gland is primarily regulated by the concentration of calcium ions in the blood.When blood $Ca^{+2}$ levels fall (hypocalcemia),the parathyroid glands are stimulated to secrete parathyroid hormone $(PTH)$.$PTH$ acts to increase blood calcium levels by promoting bone resorption (releasing calcium from bones),increasing calcium reabsorption in the kidneys,and stimulating the absorption of calcium from the digestive tract via Vitamin $D$ activation.Therefore,a fall in blood $Ca^{+2}$ levels is the specific stimulus for $PTH$ release.

Which of the following conditions will stimulate the parathyroid gland to release parathyroid hormone?

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