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.
Nominal vs. Actual. The label put on the lumber you buy is called the ânominalâ lumber size. The actual size is always a little bit smaller. Nominal refers to the dimension the lumber was sawn. When a 2Ã4 is cut out of a log it is 2â³x4â³. After the board is dried and planed it becomes its actual size of 1 1/2â³x3 1/2â³. If your memory is like mine, and you need a little help remembering the actual dimensions of the lumber youâll need for your next project, then here is a quick conversion chart: Nominal Actual. 5/4â³ 1 1/8â³.