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 and calcium and phosphate regulation. Parathyroid hormone (PTH) is responsible for the endocrine regulation of calcium and phosphate. When blood levels of calcium decrease it stimulates the production of PTH, which has three physiological effects, one having a direct bearing on the kidneys.