nbme7 - chiafenwang

[ArchivalUser]

A 35 y/o man is brought to emergency dept.1 hour after he sustained a fracture of his left radius in a fall he has end-stage renal disease and been receiving hemodalysis for 10 years,An X-ray of the left upper extremity shows osteopenia.The must likely cause of osteopenia decrease synthesis and secretion of which of following substance?

A:calcitonin
B:1,25 Dihydroxycholecalciferol
C: erythropietin
D: parathyoid hormone

[ArchivalUser]

Renal disease means dysfunction in activation of vit D by 1 alpha hydroxylase, so there is decreased form of active vit D in the body.

The correct answer is B