Nuclear fuel cycle. The nuclear fuel cycle, also called nuclear fuel chain, is the progression of nuclear fuel through a series of differing stages.
Hormone responsiveness does appear if the osteoclasts are cultured in conditioned medium from osteoblasts that first have been exposed to PTH, suggesting an important role for osteoblasts in PTH-dependent bone resorption [citing references as early as 1986].
PTH is secreted by the parathyroid glands (which are attached to your thyroid) and acts on bone (via increased bone resorption) , the kidneys (via increased reabsorption of ca â¦ lcium) and the intestine (increased calcium absorption by increased levels of activated vitamin D) to increase blood calcium levels. Two hormones, called T3 and T4, â¦. 2  The Functions of Parathyroid Hormone The parathyroid consists of four glands that reside around the thyroid and that release beneficial hormones into your body to maintain your health.