Chapter 6 introduced an essential part of the cell: the. plasma membrane. Thanks to the selective permeability of. phospholipid bilayers and the activity of membrane trans-. port proteins, this structure creates an internal environment. that is different from conditions outside the cell. Our task.
When calcium levels decrease, this stimulates the parathyroid gland to release parathyroid hormone. Parathyroid hormone encourages the normal process of bone breakdown (essential for maintenance and growth of the bone). This process of bone breakdown releases calcium into the bloodstream.
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.