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Calcium

Calcium is represented by the atomic symbol Ca and has the atomic number 20. It is the fifth most common element in the earth's crust (and also in seawater) so it is very plentiful.

But calcium's most important feature is biological: it is essential for life. As already mentioned, calcium is a major component of bones and teeth, and it's also found in shells and hard corals, but it also has a more subtle function: cell signaling. Calcium ions function as messengers that mediate or trigger cascades of biological events inside cells. These events include propagation of electrical signals down neurons, contraction of muscles (including heart muscles!), cell growth, secretion of hormones,…

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Facts About Calcium

Interestingly, calcium seems to come in fifth place wherever it goes: It is the fifth most abundant element by mass in the Earth's crust (after oxygen, silicon, aluminum and iron); the fifth most abundant dissolved ion in seawater (after sodium, chloride, magnesium and sulfate); and the fifth most abundant element in the human body (after oxygen, carbon, hydrogen and nitrogen). It is, however, the most abundant metallic element in the human body, 99 percent of which can be found in our bones and teeth...

All About Calcium

It is well known that calcium is an essential mineral for the body, both for sedentary people and for high-level sportsmen, and even more so for children. If a daily intake of calcium is absolutely fundamental to maintain good health, an overdose should also be avoided, as it is dangerous for the body.

BONES AND MORE; When It Comes to Calcium, The Advice Is to Keep Eating

Experts agree that the best way to consume calcium, as well as other vitamins and minerals, is from food. ''Calcium's a nutrient,'' Dr. Heaney said. ''If you're not getting enough calcium, chances are you're not getting enough of other nutrients.''

Calcium beyond the bones

Calcium can accumulate in our bodies where it doesn't belong. Is too much calcium intake to blame?

Discovery of Calcium

Despite the long history of calcium’s compounds, the element itself was not discovered until electricity was available for use in experiments.

Explainer: how do our bones get calcium and why do they need it?

Although the richest and best absorbed source, dairy foods are not the only source of dietary calcium. Bony fish (such as tinned salmon or sardines), legumes and some nuts such as almonds, and fortified soy milk and breakfast cereals can also provide calcium in lesser amounts. But absorption of calcium from non-dairy foods may be poorer than absorption from dairy.

History of Calcium and its Uses

The compounds that are in calcium were used long before the element itself was actually discovered. Limestone which is also called calcium carbonate was called calx by the Romans. The Romans heated calx, driving off carbon dioxide to leave calcium oxide. They used this to create cement to build pieces of architecture.Calcium was not yet found until scientists were able to use electricity in experiments. At first when discovering calcium Sir Humphrey Davy could not find a way to produce more of the metal he already created. After describing his experiments he finally received a letter from Jöns Berzelius that pointed him in the right direction to create more of the calcium he had first created.

Overview of Calcium

Calcium as a nutrient is most commonly associated with the formation and metabolism of bone. Over 99 percent of total body calcium is found as calcium hydroxyapatite (Ca10[PO4]6[OH]2) in bones and teeth, where it provides hard tissue with its strength.

Researchers discover the origin of calcium in human bones

A study from several Italian institutions and the ALBA Synchrotron suggest crystalline calcium carbonate as a precursor of hydroxyapatite in the process of bone formation. Since hydroxyapatite is a mineral constituting 70% of the mass of bone, these findings may have potential applications in the development of new therapeutic approaches in bone cancer. Thanks to the MISTRAL beamline at ALBA, researchers were able to create a 3D tomogram of human cells and visualize calcium depositions inside them.

The Element Calcium

Although calcium is the fifth most abundant element in the earth's crust, it is never found free in nature since it easily forms compounds by reacting with oxygen and water. Metallic calcium was first isolated by Sir Humphry Davy in 1808 through the electrolysis of a mixture of lime (CaO) and mercuric oxide (HgO). Today, metallic calcium is obtained by displacing calcium atoms in lime with atoms of aluminum in hot, low-pressure containers. About 4.2% of the earth's crust is composed of calcium.

The Role of Calcium in Human Aging

Calcium is an essential nutrient that is necessary for many functions in human health. Calcium is the most abundant mineral in the body with 99% found in teeth and bone. Only 1% is found in serum. The serum calcium level is tightly monitored to remain within normal range by a complex metabolic process. Calcium metabolism involves other nutrients including protein, vitamin D, and phosphorus.

Your bones are made from supernovas

Calcium-rich explosions dot the Universe. One discovery in Seattle led to a worldwide race to learn more.

Resources

10 Calcium Facts

Calcium supplementation is controversial. While calcium and its compounds are not considered to be toxic, ingesting too many calcium carbonate dietary supplements or antacids can cause milk-alkali syndrome, which is associated with hypercalcemia sometimes leading to fatal renal failure. Excessive consumption would be on the order of 10 g calcium carbonate/day, though symptoms have been reported upon ingesting as little as 2.5 g calcium carbonate daily. Excessive calcium consumption has been linked to kidney stone formation and artery calcification.

Linus Pauling Institute

Calcium is a major constituent of bones and teeth and also plays an essential role as second messenger in cell-signaling pathways. Circulating calcium concentrations are tightly controlled by the parathyroid hormone (PTH) and vitamin D at the expense of the skeleton when dietary calcium intakes are inadequate.

NIH

Calcium, the most abundant mineral in the body, is found in some foods, added to others, present in some medicines (such as antacids), and available as a dietary supplement.

The Nutrition Source

About 99% of the body’s calcium is stored in bones, and the remaining 1% is found in blood, muscle, and other tissues.