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.
DECIMAL SIZE vs. NOMINAL DIAMETER SIZE. To determine the proper nominal diameter size of a screw, you will need a caliper. Some calipers have LED read-outs in decimals. The\se decimal numbers will need to be converted into a whole number to determine what the diameter of the machine screw is.) MINOR DIAMETER: The smaller diameter of a screw thread; measured from the roots on external threads and the crests on internal threads. d) THREAD PITCH: The distance between a given point on a thread and a corresponding point on the next thread.