This ion also binds to troponin to allow muscle contraction, before being pumped back into the sarcoplasmic reticulum.
An influx of this ion is thought to trigger release of neurotransmitters into the synaptic cleft. This ion also binds to troponin to allow muscle contraction, before being pumped back into the sarcoplasmic reticulum. Vitamin D increases absorption of this ion via the small intestine. In conjunction with parathyroid hormone, Vitamin D stimulates release of both this cation and phosphate from bone, where the vast majority of it is stored. For 10 points, name this plus two ion of element number 20, a deficiency in which is known as hypocalcemia.
An influx of this ion is thought to trigger release of neurotransmitters into the synaptic cleft.
{calcium} [or {Ca++}]