Glossary. Calcitonin is a hormone known to participate in calcium and phosphorus metabolism. In mammals, the major source of calcitonin is from the parafollicular or C cells in the thyroid gland, but it is also synthesized in a wide variety of other tissues, including the lung and intestinal tract.
Statistics and Probability Dictionary. Select a term from the dropdown text box. The online statistics glossary will display a definition, plus links to other related web pages. Sample Space. A sample space is a set of elements that represents all possible outcomes of a statistical experiment .
It is common to see this line: atoms are mostly empty space. That line appears inadequate and misleading. Atoms are ultimately made up of electrons and quarks. Electrons and quarks are by definition 'point particles', meaning they have no spatial extent. So there is nothing there that takes up space. Wouldn't it be more accurate to state something like 'atoms have mass and electrical fields but there is nothing there that takes up space', or, in the spirit of the 'mostly empty space' line to say 'atoms are nothing but empty space'.