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calcitriol vs. calcitonin

calcitriol

noun

  1. Biochemistry.a vitamin D compound, C 27 H 44 O 3 , occurring in humans as a hormone derived from cholesterol, that acts in the regulation and absorption of calcium.

  2. Pharmacology.a preparation of this compound, used in the treatment of osteoporosis and bone fracture.

calcitonin

noun

Biochemistry.

  1. a polypeptide hormone that participates in the regulation of calcium levels in vertebrates by inhibiting loss of calcium from bone to the blood.