In fertilization, the release of this ion following the fusion of the gamete membranes triggers the cortical reaction, which blocks against polyspermy.
In fertilization, the release of this ion following the fusion of the gamete membranes triggers the cortical reaction, which blocks against polyspermy. Along with cyclic AMP, this ion is a common secondary messenger in cells. Inositol triphosphate, or IP3, causes the release of this ion from the smooth ER, and the release of (*) parathyroid hormone activates vitamin D, which triggers the reuptake of this ion in the intestines. The release of this ion triggers muscle contraction, and a deficiency of it can lead to osteoporosis. For 10 points, name this essential mineral that is stored in bones and teeth, symbolized Ca+2.
In fertilization, the release of this ion following the fusion of the gamete membranes triggers the cortical reaction, which blocks against polyspermy.
 calcium (accept Ca+2 before end of question)