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When calcium is needed, the parathyroid gland sends the parathyroid hormone to the kidneys to trigger the production of vitamin D (which is actually classified as a hormone). The vitamin D hormone, in turn, prompts the intestines to transfer calcium from food to the blood. When calcium intake is too small to support normal functions, both vitamin D and the parathyroid hormone trigger a process in which stored calcium is mobilized from the bones.

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14y ago
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13y ago

Once the concentration of calcium exceeds the threshold in the blood, it is filtered by the kidney and excreted as urine. Also too much calcium can precipitate and form what we call kidney stones.

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Q: What happens to calcium if there is not enough vitamin d to absorb it?
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If there is a lack of Vitamin D in someoneâ??s diet, the body will be unable to absorb calcium. This can make bones weak and can harm the immune system.


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