Thyroid Physiology — Practice
A 55-year-old man with chronic kidney disease has a serum calcium of 7.2 mg/dL and elevated parathyroid hormone. Which renal action of parathyroid hormone is impaired in his diseased kidneys, contributing to his hypocalcaemia?
AStimulation of 1-alpha-hydroxylase converting 25-OH vitamin D to calcitriol
BStimulation of phosphate reabsorption in the proximal tubule
CInhibition of calcium reabsorption in the distal tubule
DInhibition of sodium reabsorption in the loop of Henle