The parathyroids produce a hormone called parathyroid hormone (PTH). PTHPTH-parathyroid hormone raises the blood calcium level by: 1  breaking down the bone (where most of the body's calcium is stored) and causing calcium release. 2  increasing the body's ability to absorb calcium from food.THPTH-parathyroid hormone raises the blood calcium level by: 1  breaking down the bone (where most of the body's calcium is stored) and causing calcium release. 2  increasing the body's ability to absorb calcium from food.
DN = Diameter Nominal. The term Diameter Nominal refers to the internal diameter of a pipe. Together with the nominal pressure rating and the materials class, all dimensions of a piping line, e. g. flange dimensions, are defined by indicating the nominal diameter. Steel is often not specified, but assumed as material.
The number on a number-sized thread tells you the nominal outside diameter. (In practice, the OD is made a bit smaller than this, just as a 1 OD thread isn't actually 1 inch OD.) The formula for working out the OD of a number thread is: # x 0.013 + 0.060 = nominal OD in inches. In other words, multiply the number given by 0.013 and add 0.060 to it.