Calcium Regulation and Hormonal Control

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<p>Stimulates renal production of active vitamin D (D)</p> Signup and view all the answers

<p>Calcitonin (B)</p> Signup and view all the answers

A hormone that increases blood calcium levels by stimulating bone resorption and calcium reabsorption in the kidneys.

The process where bone cells break down bone tissue, releasing calcium into the bloodstream.

A hormone that increases calcium absorption in the intestines, indirectly increasing blood calcium levels.

A hormone that decreases blood calcium levels by inhibiting bone resorption.

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The process where calcium is reabsorbed back into the bloodstream from the kidneys.

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Three hormones (PTH, vitamin D, calcitonin) regulate serum calcium (Ca2+) levels.
Their secretion rate changes in response to ionized Ca2+ levels.
Parathyroid hormone (PTH) secretion increases when ionized Ca2+ decreases, and vice versa.
PTH affects bone and kidneys.
In bone, PTH activates osteoclasts, causing bone resorption and releasing Ca2+ into the extracellular fluid (ECF).
In kidneys, PTH increases tubular reabsorption of Ca2+ ions, thus conserving calcium.
PTH also stimulates the kidney to produce active vitamin D.