DeLuca 1973 1,25-(OH)2 vit D3 + Brown 1993 calcium-sensing-receptor CaSR: Ca2+ low -> PTH up -> renal 1-alpha-hydroxylase -> calcitriol -> intestinal absorption; tight Ca homeostasis.
DeLuca 1973 1,25-(OH)2 vit D3 + Brown 1993 calcium-sensing-receptor CaSR: Ca2+ low -> PTH up -> renal 1-alpha-hydroxylase -> calcitriol -> intestinal absorption; tight Ca homeostasis.