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].
INTRODUCTION. Parathyroid hormone (PTH) is an 84-amino acid polypeptide secreted by the parathyroid glands in response to relatively small changes in serum calcium (figure 1).Like all peptide hormones it has an N-terminal and C-terminal region.NTRODUCTION. Parathyroid hormone (PTH) is an 84-amino acid polypeptide secreted by the parathyroid glands in response to relatively small changes in serum calcium (figure 1). Like all peptide hormones it has an N-terminal and C-terminal region.