History and Uses: 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).ther common compounds of calcium include: calcium sulfate (CaSO 4), also known as gypsum, which is used to make dry wall and plaster of Paris, calcium nitrate (Ca(NO 3) 2), a naturally occurring fertilizer and calcium phosphate (Ca 3 (PO 4) 2), the main material found in bones and teeth.
incretin: A gastrointestinal hormone causing an increase in the amount of insulin released from the beta cells of the islets of Langerhans after eating, even before blood glucose levels become elevated.
The definition of a hormone is a chemical substance produced by an endocrine gland that has a specific effect on the activities of other organs in the body. The major female and male hormones can be classified as estrogens or androgens.he definition of a hormone is a chemical substance produced by an endocrine gland that has a specific effect on the activities of other organs in the body. The major female and male hormones can be classified as estrogens or androgens.