<unk>  plays a vital role in the anatomy, physiology and biochemistry of organisms and of the cell, particularly in signal transduction pathways. The skeleton acts as a major mineral storage site for the element and releases Ca2+ ions into the bloodstream under controlled conditions.  Circulating<unk>  is either in the free, ionized form or bound to blood proteins such as serum albumin.  The hormone secreted by the parathyroid gland, parathyroid hormone, regulates the resorption of Ca2+ from bone.
Calcium in biology
Blood flow
Insulinoma causes
Cardiac cycle
Oxygen permeability
Fluence
Gastrointestinal physiology
Magnesium and the cardiovascular system