Bones and teeth store about 99 percent of your calcium
Almost all of the calcium in an adult sits in the skeleton and teeth, locked into mineral crystals that make bone hard. The other 1 percent circulates, and that tiny share is the one cells cannot do without.
Blood calcium stays in a narrow range. If diet and stores fall short, hormones borrow mineral from bone to protect nerves, muscles, and the heartbeat.
The skeleton is a bank, not a statue. Hardness is the visible account; the blood draws on it whenever the balance dips.
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