Vitamin D helps facilitate the intestinal absorption of this element, and the actions of osteoblasts and osteoclasts can change the level of this mineral in the bloodstream.
After a sperm cell releases ions of this element, the cortical granules of the egg to fuse with the plasma membrane and block more sperm from entering the egg. A substantial decrease in the levels of this element's ion can cause a condition called tetany, which can be corrected by the parathyroid hormone. (*) Hydroxylapatite is composed of phosphates and this element. Vitamin D helps facilitate the intestinal absorption of this element, and the actions of osteoblasts and osteoclasts can change the level of this mineral in the bloodstream. For ten points, name this alkaline earth metal responsible for the hardness of bones and teeth.
After a sperm cell releases ions of this element, the cortical granules of the egg to fuse with the plasma membrane and block more sperm from entering the egg.
calcium (accept Ca2+) &lt;BZ&gt;