the kidney plays a pivotal role in the physiologic action of pth , as this peptide hormone increases tubular calcium reabsorption , decreases tubular phosphate reabsorption , and stimulates the renal 25-hydroxy-1-hydroxylase to convert 25-hydroxyvitamin d to 1,25-dihydroxyvitamin d , the hormonal form of the vitamin that stimulates intestinal calcium absorption .
C0030520
pth
C0597192
peptide hormone