Put simply, volume refers to the number of contracts traded. For any trade to occur, the market needs to produce a buyer and a seller. A transaction occurs when buyers and sellers meet and is referred to as the market price.
This hormone is secreted from cells of the parathyroid glands and finds its major target cells in bone and kidney. Another hormone, parathyroid hormone-related protein, binds to the same receptor as parathyroid hormone and has major effects on development.
How parathyroid hormone works. Like in the thyroid, the parathyroids have receptors (in this case calcium receptors) that detect the level of calcium in the body. Parathyroid hormone (PTH) is released when these calcium receptors (CaR) on the surface of the parathyroid glands detect low blood calcium levels.ow parathyroid hormone works. Like in the thyroid, the parathyroids have receptors (in this case calcium receptors) that detect the level of calcium in the body. Parathyroid hormone (PTH) is released when these calcium receptors (CaR) on the surface of the parathyroid glands detect low blood calcium levels.