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].
Parathyroid Hormone/PTH. Hydrophilic, polypeptide non tropic hormone produced and secreted by parathyroid glands increases plasma concentration of Ca2+ by increasing calcium absorption within the intestines and kidneys and by releasing calcium from bones.