Calcium homeostasis (PTH + vit D)

Layer 3 — Biologyin the Endocrine System subtree

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.

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