The synthesis of calcitriol, a steroid hormone secreted by the kidney, is dependent on the availability of a related steroid called cholecalciferol (vitamin D₃), which may be synthesized in the skin or absorbed from the diet.

Question

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The synthesis of calcitriol is dependent on the availability of cholecalciferol, which can be synthesized in the skin or absorbed from the diet.

The Synthesis of Calcitriol, a Steroid Hormone Secreted by the Kidney