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glucocorticoids increase urinary calcium excretion and decrease intestinal calcium absorption no effect on calcium level in normal or primary hyperparathyroidism; effective in hypercalcemia due to malignancy with elevated vitamin D levels (many types of malignancies raise the vitamin D level). [22] also effective in hypervitaminosis D and ...
The low levels of PTH have several other effects: there is increased loss of calcium in the urine, but more importantly, the loss of phosphate ions through urine is inhibited. Phosphate ions will therefore be retained in the plasma where they form insoluble salts with calcium ions, thereby removing them from the ionized calcium pool in the blood.
Specific signals can trigger a sudden increase in the cytoplasmic Ca 2+ levels to 500–1,000 nM by opening channels in the ER or the plasma membrane. The most common signaling pathway that increases cytoplasmic calcium concentration is the phospholipase C (PLC) pathway.
The bones act as a (metaphorical) "bank of calcium" from which the body can make "withdrawals" as needed to keep the amount of calcium in the blood at appropriate levels despite the ever-present challenges of metabolism, stress, and nutritional variations. PTH is "a key that unlocks the bank vault" to remove the calcium.
The observation that calcitriol stimulates the release of calcium from bone seems contradictory, given that sufficient levels of serum calcitriol generally prevent overall loss of calcium from bone. It is believed that the increased levels of serum calcium resulting from calcitriol-stimulated intestinal uptake causes bone to take up more ...
Some research suggests that increased calcium intake reduces ... It is the first of its kind to directly measure levels of calcium and magnesium in blood — a much more reliable method of ...