Neuroscience

Calcium is key to age-related memory loss

Research at the University of Leicester is offering new clues into how and why cognitive functions such as memory and learning become impaired with age. A paper published recently in a specialist neuroscience journal shows ...

Health

Osteoporosis and a bone-healthy diet

DEAR MAYO CLINIC: I was recently diagnosed with osteoporosis and my health care team suggested that I eat a bone-healthy diet to prevent more issues and maintain strong bones as I age. What is osteoporosis, and how can I ...

Medical research

Dental enamel can't regenerate, right? Think again

Dental enamel is tricky stuff. Even though it's the body's hardest material, if it wears away from cavities, acidic food or drinks or overbrushing, it doesn't regenerate.

Neuroscience

Calcium waves in the brain alleviate depressive behavior in mice

Researchers at the RIKEN Brain Science Institute in Japan have discovered that the benefits of stimulating the brain with direct current come from its effects on astrocytes—not neurons—in the mouse brain. Published in ...

Medical research

Unexpected discovery opens a new way to regulate blood pressure

High blood pressure, or hypertension, is the leading modifiable risk factor for cardiovascular diseases and premature death worldwide. And key to treating patients with conditions ranging from chest pain to stroke is understanding ...

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Calcium

Calcium (pronounced /ˈkælsiəm/) is the chemical element with the symbol Ca and atomic number 20. It has an atomic mass of 40.078 amu. Calcium is a soft grey alkaline earth metal, and is the fifth most abundant element by mass in the Earth's crust. Calcium is also the fifth most abundant dissolved ion in seawater by both molarity and mass, after sodium, chloride, magnesium, and sulfate.

Calcium is essential for living organisms, particularly in cell physiology, where movement of the calcium ion Ca2+ into and out of the cytoplasm functions as a signal for many cellular processes. As a major material used in mineralization of bones and shells, calcium is the most abundant metal by mass in many animals.

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