Vitamin D helps the GI tract absorb this ion.
This ion is released when the ryanodine receptor is activated and turns into a channel in the sarcoplasmic reticulum. Excess intake of this ion can lead to buildup of this ion's oxalate in the kidney, which causes (*) kidney stones. Influx of this ion causes the release of synaptic vesicles, and it binds to troponin to allow muscles to contract. Vitamin D helps the GI tract absorb this ion. Phosphoric acid allegedly replaces this ion's phosphate in the tissue that most notably stores it. For 10 points, name this ion that is found in teeth and bones.
This ion is released when the ryanodine receptor is activated and turns into a channel in the sarcoplasmic reticulum.
{calcium} [or {Ca2+}]