Calcium Definition–noun Chemistry, Biology. | a silver-white divalent metal, occurring combined in limestone, chalk, gypsum, etc., occurring also in vertebrates and other animals, as a component of bone, skeletal mass, shell, etc., and as a necessary element in nerve conduction, heartbeat, muscle contraction, and many other physiological functions. Symbol: Ca; atomic weight: 40.08; atomic number: 20; specific gravity: 1.55 at 20°C. |
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From Dictionary
Related topics from Britannicacalcium deficiency
condition in which calcium is insufficient or is not utilized properly. Calcium is the mineral that is most likely to be deficient in the average diet. It is the chief supportive element in bones and ...
calcium
chemical element, one of the alkaline-earth metals of main Group 2 (IIa) of the periodic table. It is the most abundant metallic element in the human body and the fifth most abundant element in the ...
digestive system, human
Calcium is required for the construction of bone; it forms part of the substance cementing together the walls of adjacent cells; and it is vital in the responsiveness to stimuli of muscle and nerve ...
nutritional disease
Almost all the calcium in the body is in the bones and teeth, the skeleton serving as a reservoir for calcium needed in the blood and elsewhere. During childhood and adolescence, adequate calcium ...
cell
Many animal cells can perform a primary active transport of calcium out of the cell, developing a 10,000-fold gradient of that ion. Calcium-activated ATPases have been isolated and shown to be ...
nervous system
As with potassium channels, there is more than one type of calcium channel. The inward calcium current is slower than the sodium current. There are at least two types of current in certain neurons of ...
bone
As important as the structural properties of bone is the role bone plays in the maintenance of the ionic composition of the blood and interstitial fluids of the body. All vertebrates possessing true ...
endocrine system
Fishes have no parathyroid glands: these glands first appear in amphibians. Although the embryological origin of parathyroid glands of tetrapods is well known, their evolutionary origin is not. ...
quicklime
calcium oxide, an alkaline inorganic compound of calcium (q.v.).lime
calcium oxide, an alkaline inorganic compound of calcium (q.v.). |
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EFSA says calcium sulphate safe in supplements
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