Rani has read how important Ca2+ ions are to muscle contraction and neuron function. Rani, age 25, hates milk and most dairy products, and doesn't think she eats many foods that are sources of calcium, nor does she take supplements. Why don't Rani's muscles and nerves show problems related to calcium deficiency? What problems might Rani encounter later in life if she continues this lifestyle?

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Rani's skeleton contains enough Ca2+ to, under the influence of PTH, release Ca2+ to maintain normal blood levels.
The muscles, nerves, and other cells are thus able to obtain sufficient Ca2+. It is also likely that Rani consumes at
least small amounts of Ca2+ in her diet. Rani will eventually lose enough bone density to be prone to fractures.

Anatomy & Physiology

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